Add m-esr52 at 52.6.0

1 files changed, 2749 insertions, 0 deletions

diff --git a/media/libvpx/vp9/encoder/vp9_firstpass.c b/media/libvpx/vp9/encoder/vp9_firstpass.c
new file mode 100644
index 000000000..856a6655c
--- /dev/null
+++ b/media/libvpx/vp9/encoder/vp9_firstpass.c
@@ -0,0 +1,2749 @@
+/*
+ *  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 <math.h>
+#include <stdio.h>
+
+#include "./vpx_dsp_rtcd.h"
+#include "./vpx_scale_rtcd.h"
+
+#include "vpx_mem/vpx_mem.h"
+#include "vpx_ports/mem.h"
+#include "vpx_scale/vpx_scale.h"
+#include "vpx_scale/yv12config.h"
+
+#include "vp9/common/vp9_entropymv.h"
+#include "vp9/common/vp9_quant_common.h"
+#include "vp9/common/vp9_reconinter.h"  // vp9_setup_dst_planes()
+#include "vp9/common/vp9_systemdependent.h"
+#include "vp9/encoder/vp9_aq_variance.h"
+#include "vp9/encoder/vp9_block.h"
+#include "vp9/encoder/vp9_encodeframe.h"
+#include "vp9/encoder/vp9_encodemb.h"
+#include "vp9/encoder/vp9_encodemv.h"
+#include "vp9/encoder/vp9_encoder.h"
+#include "vp9/encoder/vp9_extend.h"
+#include "vp9/encoder/vp9_firstpass.h"
+#include "vp9/encoder/vp9_mcomp.h"
+#include "vp9/encoder/vp9_quantize.h"
+#include "vp9/encoder/vp9_rd.h"
+#include "vp9/encoder/vp9_variance.h"
+
+#define OUTPUT_FPF          0
+#define ARF_STATS_OUTPUT    0
+
+#define GROUP_ADAPTIVE_MAXQ 1
+
+#define BOOST_BREAKOUT      12.5
+#define BOOST_FACTOR        12.5
+#define ERR_DIVISOR         128.0
+#define FACTOR_PT_LOW       0.70
+#define FACTOR_PT_HIGH      0.90
+#define FIRST_PASS_Q        10.0
+#define GF_MAX_BOOST        96.0
+#define INTRA_MODE_PENALTY  1024
+#define KF_MAX_BOOST        128.0
+#define MIN_ARF_GF_BOOST    240
+#define MIN_DECAY_FACTOR    0.01
+#define MIN_KF_BOOST        300
+#define NEW_MV_MODE_PENALTY 32
+#define SVC_FACTOR_PT_LOW   0.45
+#define DARK_THRESH         64
+#define DEFAULT_GRP_WEIGHT  1.0
+#define RC_FACTOR_MIN       0.75
+#define RC_FACTOR_MAX       1.75
+
+
+#define NCOUNT_INTRA_THRESH 8192
+#define NCOUNT_INTRA_FACTOR 3
+#define NCOUNT_FRAME_II_THRESH 5.0
+
+#define DOUBLE_DIVIDE_CHECK(x) ((x) < 0 ? (x) - 0.000001 : (x) + 0.000001)
+
+#if ARF_STATS_OUTPUT
+unsigned int arf_count = 0;
+#endif
+
+// Resets the first pass file to the given position using a relative seek from
+// the current position.
+static void reset_fpf_position(TWO_PASS *p,
+                               const FIRSTPASS_STATS *position) {
+  p->stats_in = position;
+}
+
+// Read frame stats at an offset from the current position.
+static const FIRSTPASS_STATS *read_frame_stats(const TWO_PASS *p, int offset) {
+  if ((offset >= 0 && p->stats_in + offset >= p->stats_in_end) ||
+      (offset < 0 && p->stats_in + offset < p->stats_in_start)) {
+    return NULL;
+  }
+
+  return &p->stats_in[offset];
+}
+
+static int input_stats(TWO_PASS *p, FIRSTPASS_STATS *fps) {
+  if (p->stats_in >= p->stats_in_end)
+    return EOF;
+
+  *fps = *p->stats_in;
+  ++p->stats_in;
+  return 1;
+}
+
+static void output_stats(FIRSTPASS_STATS *stats,
+                         struct vpx_codec_pkt_list *pktlist) {
+  struct vpx_codec_cx_pkt pkt;
+  pkt.kind = VPX_CODEC_STATS_PKT;
+  pkt.data.twopass_stats.buf = stats;
+  pkt.data.twopass_stats.sz = sizeof(FIRSTPASS_STATS);
+  vpx_codec_pkt_list_add(pktlist, &pkt);
+
+// TEMP debug code
+#if OUTPUT_FPF
+  {
+    FILE *fpfile;
+    fpfile = fopen("firstpass.stt", "a");
+
+    fprintf(fpfile, "%12.0lf %12.4lf %12.0lf %12.0lf %12.0lf %12.4lf %12.4lf"
+            "%12.4lf %12.4lf %12.4lf %12.4lf %12.4lf %12.4lf %12.4lf"
+            "%12.4lf %12.0lf %12.0lf %12.0lf %12.4lf\n",
+            stats->frame,
+            stats->weight,
+            stats->intra_error,
+            stats->coded_error,
+            stats->sr_coded_error,
+            stats->pcnt_inter,
+            stats->pcnt_motion,
+            stats->pcnt_second_ref,
+            stats->pcnt_neutral,
+            stats->MVr,
+            stats->mvr_abs,
+            stats->MVc,
+            stats->mvc_abs,
+            stats->MVrv,
+            stats->MVcv,
+            stats->mv_in_out_count,
+            stats->new_mv_count,
+            stats->count,
+            stats->duration);
+    fclose(fpfile);
+  }
+#endif
+}
+
+#if CONFIG_FP_MB_STATS
+static void output_fpmb_stats(uint8_t *this_frame_mb_stats, VP9_COMMON *cm,
+                         struct vpx_codec_pkt_list *pktlist) {
+  struct vpx_codec_cx_pkt pkt;
+  pkt.kind = VPX_CODEC_FPMB_STATS_PKT;
+  pkt.data.firstpass_mb_stats.buf = this_frame_mb_stats;
+  pkt.data.firstpass_mb_stats.sz = cm->initial_mbs * sizeof(uint8_t);
+  vpx_codec_pkt_list_add(pktlist, &pkt);
+}
+#endif
+
+static void zero_stats(FIRSTPASS_STATS *section) {
+  section->frame = 0.0;
+  section->weight = 0.0;
+  section->intra_error = 0.0;
+  section->coded_error = 0.0;
+  section->sr_coded_error = 0.0;
+  section->pcnt_inter  = 0.0;
+  section->pcnt_motion  = 0.0;
+  section->pcnt_second_ref = 0.0;
+  section->pcnt_neutral = 0.0;
+  section->MVr        = 0.0;
+  section->mvr_abs     = 0.0;
+  section->MVc        = 0.0;
+  section->mvc_abs     = 0.0;
+  section->MVrv       = 0.0;
+  section->MVcv       = 0.0;
+  section->mv_in_out_count  = 0.0;
+  section->new_mv_count = 0.0;
+  section->count      = 0.0;
+  section->duration   = 1.0;
+  section->spatial_layer_id = 0;
+}
+
+static void accumulate_stats(FIRSTPASS_STATS *section,
+                             const FIRSTPASS_STATS *frame) {
+  section->frame += frame->frame;
+  section->weight += frame->weight;
+  section->spatial_layer_id = frame->spatial_layer_id;
+  section->intra_error += frame->intra_error;
+  section->coded_error += frame->coded_error;
+  section->sr_coded_error += frame->sr_coded_error;
+  section->pcnt_inter  += frame->pcnt_inter;
+  section->pcnt_motion += frame->pcnt_motion;
+  section->pcnt_second_ref += frame->pcnt_second_ref;
+  section->pcnt_neutral += frame->pcnt_neutral;
+  section->MVr        += frame->MVr;
+  section->mvr_abs     += frame->mvr_abs;
+  section->MVc        += frame->MVc;
+  section->mvc_abs     += frame->mvc_abs;
+  section->MVrv       += frame->MVrv;
+  section->MVcv       += frame->MVcv;
+  section->mv_in_out_count  += frame->mv_in_out_count;
+  section->new_mv_count += frame->new_mv_count;
+  section->count      += frame->count;
+  section->duration   += frame->duration;
+}
+
+static void subtract_stats(FIRSTPASS_STATS *section,
+                           const FIRSTPASS_STATS *frame) {
+  section->frame -= frame->frame;
+  section->weight -= frame->weight;
+  section->intra_error -= frame->intra_error;
+  section->coded_error -= frame->coded_error;
+  section->sr_coded_error -= frame->sr_coded_error;
+  section->pcnt_inter  -= frame->pcnt_inter;
+  section->pcnt_motion -= frame->pcnt_motion;
+  section->pcnt_second_ref -= frame->pcnt_second_ref;
+  section->pcnt_neutral -= frame->pcnt_neutral;
+  section->MVr        -= frame->MVr;
+  section->mvr_abs     -= frame->mvr_abs;
+  section->MVc        -= frame->MVc;
+  section->mvc_abs     -= frame->mvc_abs;
+  section->MVrv       -= frame->MVrv;
+  section->MVcv       -= frame->MVcv;
+  section->mv_in_out_count  -= frame->mv_in_out_count;
+  section->new_mv_count -= frame->new_mv_count;
+  section->count      -= frame->count;
+  section->duration   -= frame->duration;
+}
+
+
+// Calculate a modified Error used in distributing bits between easier and
+// harder frames.
+static double calculate_modified_err(const TWO_PASS *twopass,
+                                     const VP9EncoderConfig *oxcf,
+                                     const FIRSTPASS_STATS *this_frame) {
+  const FIRSTPASS_STATS *const stats = &twopass->total_stats;
+  const double av_weight = stats->weight / stats->count;
+  const double av_err = (stats->coded_error * av_weight) / stats->count;
+  const double modified_error =
+    av_err * pow(this_frame->coded_error * this_frame->weight /
+                 DOUBLE_DIVIDE_CHECK(av_err), oxcf->two_pass_vbrbias / 100.0);
+  return fclamp(modified_error,
+                twopass->modified_error_min, twopass->modified_error_max);
+}
+
+// This function returns the maximum target rate per frame.
+static int frame_max_bits(const RATE_CONTROL *rc,
+                          const VP9EncoderConfig *oxcf) {
+  int64_t max_bits = ((int64_t)rc->avg_frame_bandwidth *
+                          (int64_t)oxcf->two_pass_vbrmax_section) / 100;
+  if (max_bits < 0)
+    max_bits = 0;
+  else if (max_bits > rc->max_frame_bandwidth)
+    max_bits = rc->max_frame_bandwidth;
+
+  return (int)max_bits;
+}
+
+void vp9_init_first_pass(VP9_COMP *cpi) {
+  zero_stats(&cpi->twopass.total_stats);
+}
+
+void vp9_end_first_pass(VP9_COMP *cpi) {
+  if (is_two_pass_svc(cpi)) {
+    int i;
+    for (i = 0; i < cpi->svc.number_spatial_layers; ++i) {
+      output_stats(&cpi->svc.layer_context[i].twopass.total_stats,
+                   cpi->output_pkt_list);
+    }
+  } else {
+    output_stats(&cpi->twopass.total_stats, cpi->output_pkt_list);
+  }
+}
+
+static vp9_variance_fn_t get_block_variance_fn(BLOCK_SIZE bsize) {
+  switch (bsize) {
+    case BLOCK_8X8:
+      return vpx_mse8x8;
+    case BLOCK_16X8:
+      return vpx_mse16x8;
+    case BLOCK_8X16:
+      return vpx_mse8x16;
+    default:
+      return vpx_mse16x16;
+  }
+}
+
+static unsigned int get_prediction_error(BLOCK_SIZE bsize,
+                                         const struct buf_2d *src,
+                                         const struct buf_2d *ref) {
+  unsigned int sse;
+  const vp9_variance_fn_t fn = get_block_variance_fn(bsize);
+  fn(src->buf, src->stride, ref->buf, ref->stride, &sse);
+  return sse;
+}
+
+#if CONFIG_VP9_HIGHBITDEPTH
+static vp9_variance_fn_t highbd_get_block_variance_fn(BLOCK_SIZE bsize,
+                                                      int bd) {
+  switch (bd) {
+    default:
+      switch (bsize) {
+        case BLOCK_8X8:
+          return vpx_highbd_8_mse8x8;
+        case BLOCK_16X8:
+          return vpx_highbd_8_mse16x8;
+        case BLOCK_8X16:
+          return vpx_highbd_8_mse8x16;
+        default:
+          return vpx_highbd_8_mse16x16;
+      }
+      break;
+    case 10:
+      switch (bsize) {
+        case BLOCK_8X8:
+          return vpx_highbd_10_mse8x8;
+        case BLOCK_16X8:
+          return vpx_highbd_10_mse16x8;
+        case BLOCK_8X16:
+          return vpx_highbd_10_mse8x16;
+        default:
+          return vpx_highbd_10_mse16x16;
+      }
+      break;
+    case 12:
+      switch (bsize) {
+        case BLOCK_8X8:
+          return vpx_highbd_12_mse8x8;
+        case BLOCK_16X8:
+          return vpx_highbd_12_mse16x8;
+        case BLOCK_8X16:
+          return vpx_highbd_12_mse8x16;
+        default:
+          return vpx_highbd_12_mse16x16;
+      }
+      break;
+  }
+}
+
+static unsigned int highbd_get_prediction_error(BLOCK_SIZE bsize,
+                                                const struct buf_2d *src,
+                                                const struct buf_2d *ref,
+                                                int bd) {
+  unsigned int sse;
+  const vp9_variance_fn_t fn = highbd_get_block_variance_fn(bsize, bd);
+  fn(src->buf, src->stride, ref->buf, ref->stride, &sse);
+  return sse;
+}
+#endif  // CONFIG_VP9_HIGHBITDEPTH
+
+// Refine the motion search range according to the frame dimension
+// for first pass test.
+static int get_search_range(const VP9_COMP *cpi) {
+  int sr = 0;
+  const int dim = MIN(cpi->initial_width, cpi->initial_height);
+
+  while ((dim << sr) < MAX_FULL_PEL_VAL)
+    ++sr;
+  return sr;
+}
+
+static void first_pass_motion_search(VP9_COMP *cpi, MACROBLOCK *x,
+                                     const MV *ref_mv, MV *best_mv,
+                                     int *best_motion_err) {
+  MACROBLOCKD *const xd = &x->e_mbd;
+  MV tmp_mv = {0, 0};
+  MV ref_mv_full = {ref_mv->row >> 3, ref_mv->col >> 3};
+  int num00, tmp_err, n;
+  const BLOCK_SIZE bsize = xd->mi[0]->mbmi.sb_type;
+  vp9_variance_fn_ptr_t v_fn_ptr = cpi->fn_ptr[bsize];
+  const int new_mv_mode_penalty = NEW_MV_MODE_PENALTY;
+
+  int step_param = 3;
+  int further_steps = (MAX_MVSEARCH_STEPS - 1) - step_param;
+  const int sr = get_search_range(cpi);
+  step_param += sr;
+  further_steps -= sr;
+
+  // Override the default variance function to use MSE.
+  v_fn_ptr.vf = get_block_variance_fn(bsize);
+#if CONFIG_VP9_HIGHBITDEPTH
+  if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
+    v_fn_ptr.vf = highbd_get_block_variance_fn(bsize, xd->bd);
+  }
+#endif  // CONFIG_VP9_HIGHBITDEPTH
+
+  // Center the initial step/diamond search on best mv.
+  tmp_err = cpi->diamond_search_sad(x, &cpi->ss_cfg, &ref_mv_full, &tmp_mv,
+                                    step_param,
+                                    x->sadperbit16, &num00, &v_fn_ptr, ref_mv);
+  if (tmp_err < INT_MAX)
+    tmp_err = vp9_get_mvpred_var(x, &tmp_mv, ref_mv, &v_fn_ptr, 1);
+  if (tmp_err < INT_MAX - new_mv_mode_penalty)
+    tmp_err += new_mv_mode_penalty;
+
+  if (tmp_err < *best_motion_err) {
+    *best_motion_err = tmp_err;
+    *best_mv = tmp_mv;
+  }
+
+  // Carry out further step/diamond searches as necessary.
+  n = num00;
+  num00 = 0;
+
+  while (n < further_steps) {
+    ++n;
+
+    if (num00) {
+      --num00;
+    } else {
+      tmp_err = cpi->diamond_search_sad(x, &cpi->ss_cfg, &ref_mv_full, &tmp_mv,
+                                        step_param + n, x->sadperbit16,
+                                        &num00, &v_fn_ptr, ref_mv);
+      if (tmp_err < INT_MAX)
+        tmp_err = vp9_get_mvpred_var(x, &tmp_mv, ref_mv, &v_fn_ptr, 1);
+      if (tmp_err < INT_MAX - new_mv_mode_penalty)
+        tmp_err += new_mv_mode_penalty;
+
+      if (tmp_err < *best_motion_err) {
+        *best_motion_err = tmp_err;
+        *best_mv = tmp_mv;
+      }
+    }
+  }
+}
+
+static BLOCK_SIZE get_bsize(const VP9_COMMON *cm, int mb_row, int mb_col) {
+  if (2 * mb_col + 1 < cm->mi_cols) {
+    return 2 * mb_row + 1 < cm->mi_rows ? BLOCK_16X16
+                                        : BLOCK_16X8;
+  } else {
+    return 2 * mb_row + 1 < cm->mi_rows ? BLOCK_8X16
+                                        : BLOCK_8X8;
+  }
+}
+
+static int find_fp_qindex(vpx_bit_depth_t bit_depth) {
+  int i;
+
+  for (i = 0; i < QINDEX_RANGE; ++i)
+    if (vp9_convert_qindex_to_q(i, bit_depth) >= FIRST_PASS_Q)
+      break;
+
+  if (i == QINDEX_RANGE)
+    i--;
+
+  return i;
+}
+
+static void set_first_pass_params(VP9_COMP *cpi) {
+  VP9_COMMON *const cm = &cpi->common;
+  if (!cpi->refresh_alt_ref_frame &&
+      (cm->current_video_frame == 0 ||
+       (cpi->frame_flags & FRAMEFLAGS_KEY))) {
+    cm->frame_type = KEY_FRAME;
+  } else {
+    cm->frame_type = INTER_FRAME;
+  }
+  // Do not use periodic key frames.
+  cpi->rc.frames_to_key = INT_MAX;
+}
+
+void vp9_first_pass(VP9_COMP *cpi, const struct lookahead_entry *source) {
+  int mb_row, mb_col;
+  MACROBLOCK *const x = &cpi->td.mb;
+  VP9_COMMON *const cm = &cpi->common;
+  MACROBLOCKD *const xd = &x->e_mbd;
+  TileInfo tile;
+  struct macroblock_plane *const p = x->plane;
+  struct macroblockd_plane *const pd = xd->plane;
+  const PICK_MODE_CONTEXT *ctx = &cpi->td.pc_root->none;
+  int i;
+
+  int recon_yoffset, recon_uvoffset;
+  int64_t intra_error = 0;
+  int64_t coded_error = 0;
+  int64_t sr_coded_error = 0;
+
+  int sum_mvr = 0, sum_mvc = 0;
+  int sum_mvr_abs = 0, sum_mvc_abs = 0;
+  int64_t sum_mvrs = 0, sum_mvcs = 0;
+  int mvcount = 0;
+  int intercount = 0;
+  int second_ref_count = 0;
+  const int intrapenalty = INTRA_MODE_PENALTY;
+  double neutral_count;
+  int new_mv_count = 0;
+  int sum_in_vectors = 0;
+  MV lastmv = {0, 0};
+  TWO_PASS *twopass = &cpi->twopass;
+  const MV zero_mv = {0, 0};
+  int recon_y_stride, recon_uv_stride, uv_mb_height;
+
+  YV12_BUFFER_CONFIG *const lst_yv12 = get_ref_frame_buffer(cpi, LAST_FRAME);
+  YV12_BUFFER_CONFIG *gld_yv12 = get_ref_frame_buffer(cpi, GOLDEN_FRAME);
+  YV12_BUFFER_CONFIG *const new_yv12 = get_frame_new_buffer(cm);
+  const YV12_BUFFER_CONFIG *first_ref_buf = lst_yv12;
+
+  LAYER_CONTEXT *const lc = is_two_pass_svc(cpi) ?
+        &cpi->svc.layer_context[cpi->svc.spatial_layer_id] : NULL;
+  double intra_factor;
+  double brightness_factor;
+  BufferPool *const pool = cm->buffer_pool;
+
+  // First pass code requires valid last and new frame buffers.
+  assert(new_yv12 != NULL);
+  assert((lc != NULL) || frame_is_intra_only(cm) || (lst_yv12 != NULL));
+
+#if CONFIG_FP_MB_STATS
+  if (cpi->use_fp_mb_stats) {
+    vp9_zero_array(cpi->twopass.frame_mb_stats_buf, cm->initial_mbs);
+  }
+#endif
+
+  vp9_clear_system_state();
+
+  intra_factor = 0.0;
+  brightness_factor = 0.0;
+  neutral_count = 0.0;
+
+  set_first_pass_params(cpi);
+  vp9_set_quantizer(cm, find_fp_qindex(cm->bit_depth));
+
+  if (lc != NULL) {
+    twopass = &lc->twopass;
+
+    cpi->lst_fb_idx = cpi->svc.spatial_layer_id;
+    cpi->ref_frame_flags = VP9_LAST_FLAG;
+
+    if (cpi->svc.number_spatial_layers + cpi->svc.spatial_layer_id <
+        REF_FRAMES) {
+      cpi->gld_fb_idx =
+          cpi->svc.number_spatial_layers + cpi->svc.spatial_layer_id;
+      cpi->ref_frame_flags |= VP9_GOLD_FLAG;
+      cpi->refresh_golden_frame = (lc->current_video_frame_in_layer == 0);
+    } else {
+      cpi->refresh_golden_frame = 0;
+    }
+
+    if (lc->current_video_frame_in_layer == 0)
+      cpi->ref_frame_flags = 0;
+
+    vp9_scale_references(cpi);
+
+    // Use either last frame or alt frame for motion search.
+    if (cpi->ref_frame_flags & VP9_LAST_FLAG) {
+      first_ref_buf = vp9_get_scaled_ref_frame(cpi, LAST_FRAME);
+      if (first_ref_buf == NULL)
+        first_ref_buf = get_ref_frame_buffer(cpi, LAST_FRAME);
+    }
+
+    if (cpi->ref_frame_flags & VP9_GOLD_FLAG) {
+      gld_yv12 = vp9_get_scaled_ref_frame(cpi, GOLDEN_FRAME);
+      if (gld_yv12 == NULL) {
+        gld_yv12 = get_ref_frame_buffer(cpi, GOLDEN_FRAME);
+      }
+    } else {
+      gld_yv12 = NULL;
+    }
+
+    set_ref_ptrs(cm, xd,
+                 (cpi->ref_frame_flags & VP9_LAST_FLAG) ? LAST_FRAME: NONE,
+                 (cpi->ref_frame_flags & VP9_GOLD_FLAG) ? GOLDEN_FRAME : NONE);
+
+    cpi->Source = vp9_scale_if_required(cm, cpi->un_scaled_source,
+                                        &cpi->scaled_source);
+  }
+
+  vp9_setup_block_planes(&x->e_mbd, cm->subsampling_x, cm->subsampling_y);
+
+  vp9_setup_src_planes(x, cpi->Source, 0, 0);
+  vp9_setup_dst_planes(xd->plane, new_yv12, 0, 0);
+
+  if (!frame_is_intra_only(cm)) {
+    vp9_setup_pre_planes(xd, 0, first_ref_buf, 0, 0, NULL);
+  }
+
+  xd->mi = cm->mi_grid_visible;
+  xd->mi[0] = cm->mi;
+
+  vp9_frame_init_quantizer(cpi);
+
+  for (i = 0; i < MAX_MB_PLANE; ++i) {
+    p[i].coeff = ctx->coeff_pbuf[i][1];
+    p[i].qcoeff = ctx->qcoeff_pbuf[i][1];
+    pd[i].dqcoeff = ctx->dqcoeff_pbuf[i][1];
+    p[i].eobs = ctx->eobs_pbuf[i][1];
+  }
+  x->skip_recode = 0;
+
+  vp9_init_mv_probs(cm);
+  vp9_initialize_rd_consts(cpi);
+
+  // Tiling is ignored in the first pass.
+  vp9_tile_init(&tile, cm, 0, 0);
+
+  recon_y_stride = new_yv12->y_stride;
+  recon_uv_stride = new_yv12->uv_stride;
+  uv_mb_height = 16 >> (new_yv12->y_height > new_yv12->uv_height);
+
+  for (mb_row = 0; mb_row < cm->mb_rows; ++mb_row) {
+    MV best_ref_mv = {0, 0};
+
+    // Reset above block coeffs.
+    xd->up_available = (mb_row != 0);
+    recon_yoffset = (mb_row * recon_y_stride * 16);
+    recon_uvoffset = (mb_row * recon_uv_stride * uv_mb_height);
+
+    // Set up limit values for motion vectors to prevent them extending
+    // outside the UMV borders.
+    x->mv_row_min = -((mb_row * 16) + BORDER_MV_PIXELS_B16);
+    x->mv_row_max = ((cm->mb_rows - 1 - mb_row) * 16)
+                    + BORDER_MV_PIXELS_B16;
+
+    for (mb_col = 0; mb_col < cm->mb_cols; ++mb_col) {
+      int this_error;
+      const int use_dc_pred = (mb_col || mb_row) && (!mb_col || !mb_row);
+      const BLOCK_SIZE bsize = get_bsize(cm, mb_row, mb_col);
+      double log_intra;
+      int level_sample;
+
+#if CONFIG_FP_MB_STATS
+      const int mb_index = mb_row * cm->mb_cols + mb_col;
+#endif
+
+      vp9_clear_system_state();
+
+      xd->plane[0].dst.buf = new_yv12->y_buffer + recon_yoffset;
+      xd->plane[1].dst.buf = new_yv12->u_buffer + recon_uvoffset;
+      xd->plane[2].dst.buf = new_yv12->v_buffer + recon_uvoffset;
+      xd->left_available = (mb_col != 0);
+      xd->mi[0]->mbmi.sb_type = bsize;
+      xd->mi[0]->mbmi.ref_frame[0] = INTRA_FRAME;
+      set_mi_row_col(xd, &tile,
+                     mb_row << 1, num_8x8_blocks_high_lookup[bsize],
+                     mb_col << 1, num_8x8_blocks_wide_lookup[bsize],
+                     cm->mi_rows, cm->mi_cols);
+
+      // Do intra 16x16 prediction.
+      x->skip_encode = 0;
+      xd->mi[0]->mbmi.mode = DC_PRED;
+      xd->mi[0]->mbmi.tx_size = use_dc_pred ?
+         (bsize >= BLOCK_16X16 ? TX_16X16 : TX_8X8) : TX_4X4;
+      vp9_encode_intra_block_plane(x, bsize, 0);
+      this_error = vpx_get_mb_ss(x->plane[0].src_diff);
+#if CONFIG_VP9_HIGHBITDEPTH
+      if (cm->use_highbitdepth) {
+        switch (cm->bit_depth) {
+          case VPX_BITS_8:
+            break;
+          case VPX_BITS_10:
+            this_error >>= 4;
+            break;
+          case VPX_BITS_12:
+            this_error >>= 8;
+            break;
+          default:
+            assert(0 && "cm->bit_depth should be VPX_BITS_8, "
+                        "VPX_BITS_10 or VPX_BITS_12");
+            return;
+        }
+      }
+#endif  // CONFIG_VP9_HIGHBITDEPTH
+
+      vp9_clear_system_state();
+      log_intra = log(this_error + 1.0);
+      if (log_intra < 10.0)
+        intra_factor += 1.0 + ((10.0 - log_intra) * 0.05);
+      else
+        intra_factor += 1.0;
+
+#if CONFIG_VP9_HIGHBITDEPTH
+      if (cm->use_highbitdepth)
+        level_sample = CONVERT_TO_SHORTPTR(x->plane[0].src.buf)[0];
+      else
+        level_sample = x->plane[0].src.buf[0];
+#else
+      level_sample = x->plane[0].src.buf[0];
+#endif
+      if ((level_sample < DARK_THRESH) && (log_intra < 9.0))
+        brightness_factor += 1.0 + (0.01 * (DARK_THRESH - level_sample));
+      else
+        brightness_factor += 1.0;
+
+      // Intrapenalty below deals with situations where the intra and inter
+      // error scores are very low (e.g. a plain black frame).
+      // We do not have special cases in first pass for 0,0 and nearest etc so
+      // all inter modes carry an overhead cost estimate for the mv.
+      // When the error score is very low this causes us to pick all or lots of
+      // INTRA modes and throw lots of key frames.
+      // This penalty adds a cost matching that of a 0,0 mv to the intra case.
+      this_error += intrapenalty;
+
+      // Accumulate the intra error.
+      intra_error += (int64_t)this_error;
+
+#if CONFIG_FP_MB_STATS
+      if (cpi->use_fp_mb_stats) {
+        // initialization
+        cpi->twopass.frame_mb_stats_buf[mb_index] = 0;
+      }
+#endif
+
+      // Set up limit values for motion vectors to prevent them extending
+      // outside the UMV borders.
+      x->mv_col_min = -((mb_col * 16) + BORDER_MV_PIXELS_B16);
+      x->mv_col_max = ((cm->mb_cols - 1 - mb_col) * 16) + BORDER_MV_PIXELS_B16;
+
+      // Other than for the first frame do a motion search.
+      if ((lc == NULL && cm->current_video_frame > 0) ||
+          (lc != NULL && lc->current_video_frame_in_layer > 0)) {
+        int tmp_err, motion_error, raw_motion_error;
+        // Assume 0,0 motion with no mv overhead.
+        MV mv = {0, 0} , tmp_mv = {0, 0};
+        struct buf_2d unscaled_last_source_buf_2d;
+
+        xd->plane[0].pre[0].buf = first_ref_buf->y_buffer + recon_yoffset;
+#if CONFIG_VP9_HIGHBITDEPTH
+        if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
+          motion_error = highbd_get_prediction_error(
+              bsize, &x->plane[0].src, &xd->plane[0].pre[0], xd->bd);
+        } else {
+          motion_error = get_prediction_error(
+              bsize, &x->plane[0].src, &xd->plane[0].pre[0]);
+        }
+#else
+        motion_error = get_prediction_error(
+            bsize, &x->plane[0].src, &xd->plane[0].pre[0]);
+#endif  // CONFIG_VP9_HIGHBITDEPTH
+
+        // Compute the motion error of the 0,0 motion using the last source
+        // frame as the reference. Skip the further motion search on
+        // reconstructed frame if this error is small.
+        unscaled_last_source_buf_2d.buf =
+            cpi->unscaled_last_source->y_buffer + recon_yoffset;
+        unscaled_last_source_buf_2d.stride =
+            cpi->unscaled_last_source->y_stride;
+#if CONFIG_VP9_HIGHBITDEPTH
+        if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
+          raw_motion_error = highbd_get_prediction_error(
+              bsize, &x->plane[0].src, &unscaled_last_source_buf_2d, xd->bd);
+        } else {
+          raw_motion_error = get_prediction_error(
+              bsize, &x->plane[0].src, &unscaled_last_source_buf_2d);
+        }
+#else
+        raw_motion_error = get_prediction_error(
+            bsize, &x->plane[0].src, &unscaled_last_source_buf_2d);
+#endif  // CONFIG_VP9_HIGHBITDEPTH
+
+        // TODO(pengchong): Replace the hard-coded threshold
+        if (raw_motion_error > 25 || lc != NULL) {
+          // Test last reference frame using the previous best mv as the
+          // starting point (best reference) for the search.
+          first_pass_motion_search(cpi, x, &best_ref_mv, &mv, &motion_error);
+
+          // If the current best reference mv is not centered on 0,0 then do a
+          // 0,0 based search as well.
+          if (!is_zero_mv(&best_ref_mv)) {
+            tmp_err = INT_MAX;
+            first_pass_motion_search(cpi, x, &zero_mv, &tmp_mv, &tmp_err);
+
+            if (tmp_err < motion_error) {
+              motion_error = tmp_err;
+              mv = tmp_mv;
+            }
+          }
+
+          // Search in an older reference frame.
+          if (((lc == NULL && cm->current_video_frame > 1) ||
+               (lc != NULL && lc->current_video_frame_in_layer > 1))
+              && gld_yv12 != NULL) {
+            // Assume 0,0 motion with no mv overhead.
+            int gf_motion_error;
+
+            xd->plane[0].pre[0].buf = gld_yv12->y_buffer + recon_yoffset;
+#if CONFIG_VP9_HIGHBITDEPTH
+            if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
+              gf_motion_error = highbd_get_prediction_error(
+                  bsize, &x->plane[0].src, &xd->plane[0].pre[0], xd->bd);
+            } else {
+              gf_motion_error = get_prediction_error(
+                  bsize, &x->plane[0].src, &xd->plane[0].pre[0]);
+            }
+#else
+            gf_motion_error = get_prediction_error(
+                bsize, &x->plane[0].src, &xd->plane[0].pre[0]);
+#endif  // CONFIG_VP9_HIGHBITDEPTH
+
+            first_pass_motion_search(cpi, x, &zero_mv, &tmp_mv,
+                                     &gf_motion_error);
+
+            if (gf_motion_error < motion_error && gf_motion_error < this_error)
+              ++second_ref_count;
+
+            // Reset to last frame as reference buffer.
+            xd->plane[0].pre[0].buf = first_ref_buf->y_buffer + recon_yoffset;
+            xd->plane[1].pre[0].buf = first_ref_buf->u_buffer + recon_uvoffset;
+            xd->plane[2].pre[0].buf = first_ref_buf->v_buffer + recon_uvoffset;
+
+            // In accumulating a score for the older reference frame take the
+            // best of the motion predicted score and the intra coded error
+            // (just as will be done for) accumulation of "coded_error" for
+            // the last frame.
+            if (gf_motion_error < this_error)
+              sr_coded_error += gf_motion_error;
+            else
+              sr_coded_error += this_error;
+          } else {
+            sr_coded_error += motion_error;
+          }
+        } else {
+          sr_coded_error += motion_error;
+        }
+
+        // Start by assuming that intra mode is best.
+        best_ref_mv.row = 0;
+        best_ref_mv.col = 0;
+
+#if CONFIG_FP_MB_STATS
+        if (cpi->use_fp_mb_stats) {
+          // intra predication statistics
+          cpi->twopass.frame_mb_stats_buf[mb_index] = 0;
+          cpi->twopass.frame_mb_stats_buf[mb_index] |= FPMB_DCINTRA_MASK;
+          cpi->twopass.frame_mb_stats_buf[mb_index] |= FPMB_MOTION_ZERO_MASK;
+          if (this_error > FPMB_ERROR_LARGE_TH) {
+            cpi->twopass.frame_mb_stats_buf[mb_index] |= FPMB_ERROR_LARGE_MASK;
+          } else if (this_error < FPMB_ERROR_SMALL_TH) {
+            cpi->twopass.frame_mb_stats_buf[mb_index] |= FPMB_ERROR_SMALL_MASK;
+          }
+        }
+#endif
+
+        if (motion_error <= this_error) {
+          vp9_clear_system_state();
+
+          // Keep a count of cases where the inter and intra were very close
+          // and very low. This helps with scene cut detection for example in
+          // cropped clips with black bars at the sides or top and bottom.
+          if (((this_error - intrapenalty) * 9 <= motion_error * 10) &&
+              (this_error < (2 * intrapenalty))) {
+            neutral_count += 1.0;
+          // Also track cases where the intra is not much worse than the inter
+          // and use this in limiting the GF/arf group length.
+          } else if ((this_error > NCOUNT_INTRA_THRESH) &&
+                     (this_error < (NCOUNT_INTRA_FACTOR * motion_error))) {
+            neutral_count += (double)motion_error /
+                             DOUBLE_DIVIDE_CHECK((double)this_error);
+          }
+
+          mv.row *= 8;
+          mv.col *= 8;
+          this_error = motion_error;
+          xd->mi[0]->mbmi.mode = NEWMV;
+          xd->mi[0]->mbmi.mv[0].as_mv = mv;
+          xd->mi[0]->mbmi.tx_size = TX_4X4;
+          xd->mi[0]->mbmi.ref_frame[0] = LAST_FRAME;
+          xd->mi[0]->mbmi.ref_frame[1] = NONE;
+          vp9_build_inter_predictors_sby(xd, mb_row << 1, mb_col << 1, bsize);
+          vp9_encode_sby_pass1(x, bsize);
+          sum_mvr += mv.row;
+          sum_mvr_abs += abs(mv.row);
+          sum_mvc += mv.col;
+          sum_mvc_abs += abs(mv.col);
+          sum_mvrs += mv.row * mv.row;
+          sum_mvcs += mv.col * mv.col;
+          ++intercount;
+
+          best_ref_mv = mv;
+
+#if CONFIG_FP_MB_STATS
+          if (cpi->use_fp_mb_stats) {
+            // inter predication statistics
+            cpi->twopass.frame_mb_stats_buf[mb_index] = 0;
+            cpi->twopass.frame_mb_stats_buf[mb_index] &= ~FPMB_DCINTRA_MASK;
+            cpi->twopass.frame_mb_stats_buf[mb_index] |= FPMB_MOTION_ZERO_MASK;
+            if (this_error > FPMB_ERROR_LARGE_TH) {
+              cpi->twopass.frame_mb_stats_buf[mb_index] |=
+                  FPMB_ERROR_LARGE_MASK;
+            } else if (this_error < FPMB_ERROR_SMALL_TH) {
+              cpi->twopass.frame_mb_stats_buf[mb_index] |=
+                  FPMB_ERROR_SMALL_MASK;
+            }
+          }
+#endif
+
+          if (!is_zero_mv(&mv)) {
+            ++mvcount;
+
+#if CONFIG_FP_MB_STATS
+            if (cpi->use_fp_mb_stats) {
+              cpi->twopass.frame_mb_stats_buf[mb_index] &=
+                  ~FPMB_MOTION_ZERO_MASK;
+              // check estimated motion direction
+              if (mv.as_mv.col > 0 && mv.as_mv.col >= abs(mv.as_mv.row)) {
+                // right direction
+                cpi->twopass.frame_mb_stats_buf[mb_index] |=
+                    FPMB_MOTION_RIGHT_MASK;
+              } else if (mv.as_mv.row < 0 &&
+                         abs(mv.as_mv.row) >= abs(mv.as_mv.col)) {
+                // up direction
+                cpi->twopass.frame_mb_stats_buf[mb_index] |=
+                    FPMB_MOTION_UP_MASK;
+              } else if (mv.as_mv.col < 0 &&
+                         abs(mv.as_mv.col) >= abs(mv.as_mv.row)) {
+                // left direction
+                cpi->twopass.frame_mb_stats_buf[mb_index] |=
+                    FPMB_MOTION_LEFT_MASK;
+              } else {
+                // down direction
+                cpi->twopass.frame_mb_stats_buf[mb_index] |=
+                    FPMB_MOTION_DOWN_MASK;
+              }
+            }
+#endif
+
+            // Non-zero vector, was it different from the last non zero vector?
+            if (!is_equal_mv(&mv, &lastmv))
+              ++new_mv_count;
+            lastmv = mv;
+
+            // Does the row vector point inwards or outwards?
+            if (mb_row < cm->mb_rows / 2) {
+              if (mv.row > 0)
+                --sum_in_vectors;
+              else if (mv.row < 0)
+                ++sum_in_vectors;
+            } else if (mb_row > cm->mb_rows / 2) {
+              if (mv.row > 0)
+                ++sum_in_vectors;
+              else if (mv.row < 0)
+                --sum_in_vectors;
+            }
+
+            // Does the col vector point inwards or outwards?
+            if (mb_col < cm->mb_cols / 2) {
+              if (mv.col > 0)
+                --sum_in_vectors;
+              else if (mv.col < 0)
+                ++sum_in_vectors;
+            } else if (mb_col > cm->mb_cols / 2) {
+              if (mv.col > 0)
+                ++sum_in_vectors;
+              else if (mv.col < 0)
+                --sum_in_vectors;
+            }
+          }
+        }
+      } else {
+        sr_coded_error += (int64_t)this_error;
+      }
+      coded_error += (int64_t)this_error;
+
+      // Adjust to the next column of MBs.
+      x->plane[0].src.buf += 16;
+      x->plane[1].src.buf += uv_mb_height;
+      x->plane[2].src.buf += uv_mb_height;
+
+      recon_yoffset += 16;
+      recon_uvoffset += uv_mb_height;
+    }
+
+    // Adjust to the next row of MBs.
+    x->plane[0].src.buf += 16 * x->plane[0].src.stride - 16 * cm->mb_cols;
+    x->plane[1].src.buf += uv_mb_height * x->plane[1].src.stride -
+                           uv_mb_height * cm->mb_cols;
+    x->plane[2].src.buf += uv_mb_height * x->plane[1].src.stride -
+                           uv_mb_height * cm->mb_cols;
+
+    vp9_clear_system_state();
+  }
+
+  {
+    FIRSTPASS_STATS fps;
+    // The minimum error here insures some bit allocation to frames even
+    // in static regions. The allocation per MB declines for larger formats
+    // where the typical "real" energy per MB also falls.
+    // Initial estimate here uses sqrt(mbs) to define the min_err, where the
+    // number of mbs is proportional to the image area.
+    const int num_mbs = (cpi->oxcf.resize_mode != RESIZE_NONE)
+                        ? cpi->initial_mbs : cpi->common.MBs;
+    const double min_err = 200 * sqrt(num_mbs);
+
+    intra_factor = intra_factor / (double)num_mbs;
+    brightness_factor = brightness_factor / (double)num_mbs;
+    fps.weight = intra_factor * brightness_factor;
+
+    fps.frame = cm->current_video_frame;
+    fps.spatial_layer_id = cpi->svc.spatial_layer_id;
+    fps.coded_error = (double)(coded_error >> 8) + min_err;
+    fps.sr_coded_error = (double)(sr_coded_error >> 8) + min_err;
+    fps.intra_error = (double)(intra_error >> 8) + min_err;
+    fps.count = 1.0;
+    fps.pcnt_inter = (double)intercount / num_mbs;
+    fps.pcnt_second_ref = (double)second_ref_count / num_mbs;
+    fps.pcnt_neutral = (double)neutral_count / num_mbs;
+
+    if (mvcount > 0) {
+      fps.MVr = (double)sum_mvr / mvcount;
+      fps.mvr_abs = (double)sum_mvr_abs / mvcount;
+      fps.MVc = (double)sum_mvc / mvcount;
+      fps.mvc_abs = (double)sum_mvc_abs / mvcount;
+      fps.MVrv = ((double)sum_mvrs - (fps.MVr * fps.MVr / mvcount)) / mvcount;
+      fps.MVcv = ((double)sum_mvcs - (fps.MVc * fps.MVc / mvcount)) / mvcount;
+      fps.mv_in_out_count = (double)sum_in_vectors / (mvcount * 2);
+      fps.new_mv_count = new_mv_count;
+      fps.pcnt_motion = (double)mvcount / num_mbs;
+    } else {
+      fps.MVr = 0.0;
+      fps.mvr_abs = 0.0;
+      fps.MVc = 0.0;
+      fps.mvc_abs = 0.0;
+      fps.MVrv = 0.0;
+      fps.MVcv = 0.0;
+      fps.mv_in_out_count = 0.0;
+      fps.new_mv_count = 0.0;
+      fps.pcnt_motion = 0.0;
+    }
+
+    // TODO(paulwilkins):  Handle the case when duration is set to 0, or
+    // something less than the full time between subsequent values of
+    // cpi->source_time_stamp.
+    fps.duration = (double)(source->ts_end - source->ts_start);
+
+    // Don't want to do output stats with a stack variable!
+    twopass->this_frame_stats = fps;
+    output_stats(&twopass->this_frame_stats, cpi->output_pkt_list);
+    accumulate_stats(&twopass->total_stats, &fps);
+
+#if CONFIG_FP_MB_STATS
+    if (cpi->use_fp_mb_stats) {
+      output_fpmb_stats(twopass->frame_mb_stats_buf, cm, cpi->output_pkt_list);
+    }
+#endif
+  }
+
+  // Copy the previous Last Frame back into gf and and arf buffers if
+  // the prediction is good enough... but also don't allow it to lag too far.
+  if ((twopass->sr_update_lag > 3) ||
+      ((cm->current_video_frame > 0) &&
+       (twopass->this_frame_stats.pcnt_inter > 0.20) &&
+       ((twopass->this_frame_stats.intra_error /
+         DOUBLE_DIVIDE_CHECK(twopass->this_frame_stats.coded_error)) > 2.0))) {
+    if (gld_yv12 != NULL) {
+      ref_cnt_fb(pool->frame_bufs, &cm->ref_frame_map[cpi->gld_fb_idx],
+                 cm->ref_frame_map[cpi->lst_fb_idx]);
+    }
+    twopass->sr_update_lag = 1;
+  } else {
+    ++twopass->sr_update_lag;
+  }
+
+  vp9_extend_frame_borders(new_yv12);
+
+  if (lc != NULL) {
+    vp9_update_reference_frames(cpi);
+  } else {
+    // The frame we just compressed now becomes the last frame.
+    ref_cnt_fb(pool->frame_bufs, &cm->ref_frame_map[cpi->lst_fb_idx],
+               cm->new_fb_idx);
+  }
+
+  // Special case for the first frame. Copy into the GF buffer as a second
+  // reference.
+  if (cm->current_video_frame == 0 && cpi->gld_fb_idx != INVALID_IDX &&
+      lc == NULL) {
+    ref_cnt_fb(pool->frame_bufs, &cm->ref_frame_map[cpi->gld_fb_idx],
+               cm->ref_frame_map[cpi->lst_fb_idx]);
+  }
+
+  // Use this to see what the first pass reconstruction looks like.
+  if (0) {
+    char filename[512];
+    FILE *recon_file;
+    snprintf(filename, sizeof(filename), "enc%04d.yuv",
+             (int)cm->current_video_frame);
+
+    if (cm->current_video_frame == 0)
+      recon_file = fopen(filename, "wb");
+    else
+      recon_file = fopen(filename, "ab");
+
+    (void)fwrite(lst_yv12->buffer_alloc, lst_yv12->frame_size, 1, recon_file);
+    fclose(recon_file);
+  }
+
+  ++cm->current_video_frame;
+  if (cpi->use_svc)
+    vp9_inc_frame_in_layer(cpi);
+}
+
+static double calc_correction_factor(double err_per_mb,
+                                     double err_divisor,
+                                     double pt_low,
+                                     double pt_high,
+                                     int q,
+                                     vpx_bit_depth_t bit_depth) {
+  const double error_term = err_per_mb / err_divisor;
+
+  // Adjustment based on actual quantizer to power term.
+  const double power_term =
+      MIN(vp9_convert_qindex_to_q(q, bit_depth) * 0.01 + pt_low, pt_high);
+
+  // Calculate correction factor.
+  if (power_term < 1.0)
+    assert(error_term >= 0.0);
+
+  return fclamp(pow(error_term, power_term), 0.05, 5.0);
+}
+
+// Larger image formats are expected to be a little harder to code relatively
+// given the same prediction error score. This in part at least relates to the
+// increased size and hence coding cost of motion vectors.
+#define EDIV_SIZE_FACTOR 800
+
+static int get_twopass_worst_quality(const VP9_COMP *cpi,
+                                     const double section_err,
+                                     int section_target_bandwidth,
+                                     double group_weight_factor) {
+  const RATE_CONTROL *const rc = &cpi->rc;
+  const VP9EncoderConfig *const oxcf = &cpi->oxcf;
+
+  if (section_target_bandwidth <= 0) {
+    return rc->worst_quality;  // Highest value allowed
+  } else {
+    const int num_mbs = (cpi->oxcf.resize_mode != RESIZE_NONE)
+                        ? cpi->initial_mbs : cpi->common.MBs;
+    const double err_per_mb = section_err / num_mbs;
+    const double speed_term = 1.0 + 0.04 * oxcf->speed;
+    const double ediv_size_correction = num_mbs / EDIV_SIZE_FACTOR;
+    const int target_norm_bits_per_mb = ((uint64_t)section_target_bandwidth <<
+                                         BPER_MB_NORMBITS) / num_mbs;
+
+    int q;
+    int is_svc_upper_layer = 0;
+
+    if (is_two_pass_svc(cpi) && cpi->svc.spatial_layer_id > 0)
+      is_svc_upper_layer = 1;
+
+
+    // Try and pick a max Q that will be high enough to encode the
+    // content at the given rate.
+    for (q = rc->best_quality; q < rc->worst_quality; ++q) {
+      const double factor =
+          calc_correction_factor(err_per_mb,
+                                 ERR_DIVISOR - ediv_size_correction,
+                                 is_svc_upper_layer ? SVC_FACTOR_PT_LOW :
+                                 FACTOR_PT_LOW, FACTOR_PT_HIGH, q,
+                                 cpi->common.bit_depth);
+      const int bits_per_mb =
+        vp9_rc_bits_per_mb(INTER_FRAME, q,
+                           factor * speed_term * group_weight_factor,
+                           cpi->common.bit_depth);
+      if (bits_per_mb <= target_norm_bits_per_mb)
+        break;
+    }
+
+    // Restriction on active max q for constrained quality mode.
+    if (cpi->oxcf.rc_mode == VPX_CQ)
+      q = MAX(q, oxcf->cq_level);
+    return q;
+  }
+}
+
+static void setup_rf_level_maxq(VP9_COMP *cpi) {
+  int i;
+  RATE_CONTROL *const rc = &cpi->rc;
+  for (i = INTER_NORMAL; i < RATE_FACTOR_LEVELS; ++i) {
+    int qdelta = vp9_frame_type_qdelta(cpi, i, rc->worst_quality);
+    rc->rf_level_maxq[i] = MAX(rc->worst_quality + qdelta, rc->best_quality);
+  }
+}
+
+void vp9_init_subsampling(VP9_COMP *cpi) {
+  const VP9_COMMON *const cm = &cpi->common;
+  RATE_CONTROL *const rc = &cpi->rc;
+  const int w = cm->width;
+  const int h = cm->height;
+  int i;
+
+  for (i = 0; i < FRAME_SCALE_STEPS; ++i) {
+    // Note: Frames with odd-sized dimensions may result from this scaling.
+    rc->frame_width[i] = (w * 16) / frame_scale_factor[i];
+    rc->frame_height[i] = (h * 16) / frame_scale_factor[i];
+  }
+
+  setup_rf_level_maxq(cpi);
+}
+
+void calculate_coded_size(VP9_COMP *cpi,
+                          int *scaled_frame_width,
+                          int *scaled_frame_height) {
+  RATE_CONTROL *const rc = &cpi->rc;
+  *scaled_frame_width = rc->frame_width[rc->frame_size_selector];
+  *scaled_frame_height = rc->frame_height[rc->frame_size_selector];
+}
+
+void vp9_init_second_pass(VP9_COMP *cpi) {
+  SVC *const svc = &cpi->svc;
+  const VP9EncoderConfig *const oxcf = &cpi->oxcf;
+  const int is_two_pass_svc = (svc->number_spatial_layers > 1) ||
+                              (svc->number_temporal_layers > 1);
+  TWO_PASS *const twopass = is_two_pass_svc ?
+      &svc->layer_context[svc->spatial_layer_id].twopass : &cpi->twopass;
+  double frame_rate;
+  FIRSTPASS_STATS *stats;
+
+  zero_stats(&twopass->total_stats);
+  zero_stats(&twopass->total_left_stats);
+
+  if (!twopass->stats_in_end)
+    return;
+
+  stats = &twopass->total_stats;
+
+  *stats = *twopass->stats_in_end;
+  twopass->total_left_stats = *stats;
+
+  frame_rate = 10000000.0 * stats->count / stats->duration;
+  // Each frame can have a different duration, as the frame rate in the source
+  // isn't guaranteed to be constant. The frame rate prior to the first frame
+  // encoded in the second pass is a guess. However, the sum duration is not.
+  // It is calculated based on the actual durations of all frames from the
+  // first pass.
+
+  if (is_two_pass_svc) {
+    vp9_update_spatial_layer_framerate(cpi, frame_rate);
+    twopass->bits_left = (int64_t)(stats->duration *
+        svc->layer_context[svc->spatial_layer_id].target_bandwidth /
+        10000000.0);
+  } else {
+    vp9_new_framerate(cpi, frame_rate);
+    twopass->bits_left = (int64_t)(stats->duration * oxcf->target_bandwidth /
+                             10000000.0);
+  }
+
+  // This variable monitors how far behind the second ref update is lagging.
+  twopass->sr_update_lag = 1;
+
+  // Scan the first pass file and calculate a modified total error based upon
+  // the bias/power function used to allocate bits.
+  {
+    const double avg_error = stats->coded_error /
+                             DOUBLE_DIVIDE_CHECK(stats->count);
+    const FIRSTPASS_STATS *s = twopass->stats_in;
+    double modified_error_total = 0.0;
+    twopass->modified_error_min = (avg_error *
+                                      oxcf->two_pass_vbrmin_section) / 100;
+    twopass->modified_error_max = (avg_error *
+                                      oxcf->two_pass_vbrmax_section) / 100;
+    while (s < twopass->stats_in_end) {
+      modified_error_total += calculate_modified_err(twopass, oxcf, s);
+      ++s;
+    }
+    twopass->modified_error_left = modified_error_total;
+  }
+
+  // Reset the vbr bits off target counters
+  cpi->rc.vbr_bits_off_target = 0;
+  cpi->rc.vbr_bits_off_target_fast = 0;
+
+  cpi->rc.rate_error_estimate = 0;
+
+  // Static sequence monitor variables.
+  twopass->kf_zeromotion_pct = 100;
+  twopass->last_kfgroup_zeromotion_pct = 100;
+
+  if (oxcf->resize_mode != RESIZE_NONE) {
+    vp9_init_subsampling(cpi);
+  }
+}
+
+#define SR_DIFF_PART 0.0015
+#define MOTION_AMP_PART 0.003
+#define INTRA_PART 0.005
+#define DEFAULT_DECAY_LIMIT 0.75
+#define LOW_SR_DIFF_TRHESH 0.1
+#define SR_DIFF_MAX 128.0
+
+static double get_sr_decay_rate(const VP9_COMP *cpi,
+                                const FIRSTPASS_STATS *frame) {
+  const int num_mbs = (cpi->oxcf.resize_mode != RESIZE_NONE)
+                      ? cpi->initial_mbs : cpi->common.MBs;
+  double sr_diff =
+      (frame->sr_coded_error - frame->coded_error) / num_mbs;
+  double sr_decay = 1.0;
+  double modified_pct_inter;
+  double modified_pcnt_intra;
+  const double motion_amplitude_factor =
+    frame->pcnt_motion * ((frame->mvc_abs + frame->mvr_abs) / 2);
+
+  modified_pct_inter = frame->pcnt_inter;
+  if ((frame->intra_error / DOUBLE_DIVIDE_CHECK(frame->coded_error)) <
+      (double)NCOUNT_FRAME_II_THRESH) {
+    modified_pct_inter = frame->pcnt_inter - frame->pcnt_neutral;
+  }
+  modified_pcnt_intra = 100 * (1.0 - modified_pct_inter);
+
+
+  if ((sr_diff > LOW_SR_DIFF_TRHESH)) {
+    sr_diff = MIN(sr_diff, SR_DIFF_MAX);
+    sr_decay = 1.0 - (SR_DIFF_PART * sr_diff) -
+               (MOTION_AMP_PART * motion_amplitude_factor) -
+               (INTRA_PART * modified_pcnt_intra);
+  }
+  return MAX(sr_decay, MIN(DEFAULT_DECAY_LIMIT, modified_pct_inter));
+}
+
+// This function gives an estimate of how badly we believe the prediction
+// quality is decaying from frame to frame.
+static double get_zero_motion_factor(const VP9_COMP *cpi,
+                                     const FIRSTPASS_STATS *frame) {
+  const double zero_motion_pct = frame->pcnt_inter -
+                                 frame->pcnt_motion;
+  double sr_decay = get_sr_decay_rate(cpi, frame);
+  return MIN(sr_decay, zero_motion_pct);
+}
+
+#define ZM_POWER_FACTOR 0.75
+
+static double get_prediction_decay_rate(const VP9_COMP *cpi,
+                                        const FIRSTPASS_STATS *next_frame) {
+  const double sr_decay_rate = get_sr_decay_rate(cpi, next_frame);
+  const double zero_motion_factor =
+    (0.95 * pow((next_frame->pcnt_inter - next_frame->pcnt_motion),
+                ZM_POWER_FACTOR));
+
+  return MAX(zero_motion_factor,
+             (sr_decay_rate + ((1.0 - sr_decay_rate) * zero_motion_factor)));
+}
+
+// Function to test for a condition where a complex transition is followed
+// by a static section. For example in slide shows where there is a fade
+// between slides. This is to help with more optimal kf and gf positioning.
+static int detect_transition_to_still(VP9_COMP *cpi,
+                                      int frame_interval, int still_interval,
+                                      double loop_decay_rate,
+                                      double last_decay_rate) {
+  TWO_PASS *const twopass = &cpi->twopass;
+  RATE_CONTROL *const rc = &cpi->rc;
+
+  // Break clause to detect very still sections after motion
+  // For example a static image after a fade or other transition
+  // instead of a clean scene cut.
+  if (frame_interval > rc->min_gf_interval &&
+      loop_decay_rate >= 0.999 &&
+      last_decay_rate < 0.9) {
+    int j;
+
+    // Look ahead a few frames to see if static condition persists...
+    for (j = 0; j < still_interval; ++j) {
+      const FIRSTPASS_STATS *stats = &twopass->stats_in[j];
+      if (stats >= twopass->stats_in_end)
+        break;
+
+      if (stats->pcnt_inter - stats->pcnt_motion < 0.999)
+        break;
+    }
+
+    // Only if it does do we signal a transition to still.
+    return j == still_interval;
+  }
+
+  return 0;
+}
+
+// This function detects a flash through the high relative pcnt_second_ref
+// score in the frame following a flash frame. The offset passed in should
+// reflect this.
+static int detect_flash(const TWO_PASS *twopass, int offset) {
+  const FIRSTPASS_STATS *const next_frame = read_frame_stats(twopass, offset);
+
+  // What we are looking for here is a situation where there is a
+  // brief break in prediction (such as a flash) but subsequent frames
+  // are reasonably well predicted by an earlier (pre flash) frame.
+  // The recovery after a flash is indicated by a high pcnt_second_ref
+  // compared to pcnt_inter.
+  return next_frame != NULL &&
+         next_frame->pcnt_second_ref > next_frame->pcnt_inter &&
+         next_frame->pcnt_second_ref >= 0.5;
+}
+
+// Update the motion related elements to the GF arf boost calculation.
+static void accumulate_frame_motion_stats(const FIRSTPASS_STATS *stats,
+                                          double *mv_in_out,
+                                          double *mv_in_out_accumulator,
+                                          double *abs_mv_in_out_accumulator,
+                                          double *mv_ratio_accumulator) {
+  const double pct = stats->pcnt_motion;
+
+  // Accumulate Motion In/Out of frame stats.
+  *mv_in_out = stats->mv_in_out_count * pct;
+  *mv_in_out_accumulator += *mv_in_out;
+  *abs_mv_in_out_accumulator += fabs(*mv_in_out);
+
+  // Accumulate a measure of how uniform (or conversely how random) the motion
+  // field is (a ratio of abs(mv) / mv).
+  if (pct > 0.05) {
+    const double mvr_ratio = fabs(stats->mvr_abs) /
+                                 DOUBLE_DIVIDE_CHECK(fabs(stats->MVr));
+    const double mvc_ratio = fabs(stats->mvc_abs) /
+                                 DOUBLE_DIVIDE_CHECK(fabs(stats->MVc));
+
+    *mv_ratio_accumulator += pct * (mvr_ratio < stats->mvr_abs ?
+                                       mvr_ratio : stats->mvr_abs);
+    *mv_ratio_accumulator += pct * (mvc_ratio < stats->mvc_abs ?
+                                       mvc_ratio : stats->mvc_abs);
+  }
+}
+
+#define BASELINE_ERR_PER_MB 1000.0
+static double calc_frame_boost(VP9_COMP *cpi,
+                               const FIRSTPASS_STATS *this_frame,
+                               double this_frame_mv_in_out,
+                               double max_boost) {
+  double frame_boost;
+  const double lq =
+    vp9_convert_qindex_to_q(cpi->rc.avg_frame_qindex[INTER_FRAME],
+                            cpi->common.bit_depth);
+  const double boost_q_correction = MIN((0.5 + (lq * 0.015)), 1.5);
+  const int num_mbs = (cpi->oxcf.resize_mode != RESIZE_NONE)
+                      ? cpi->initial_mbs : cpi->common.MBs;
+
+  // Underlying boost factor is based on inter error ratio.
+  frame_boost = (BASELINE_ERR_PER_MB * num_mbs) /
+                DOUBLE_DIVIDE_CHECK(this_frame->coded_error);
+  frame_boost = frame_boost * BOOST_FACTOR * boost_q_correction;
+
+  // Increase boost for frames where new data coming into frame (e.g. zoom out).
+  // Slightly reduce boost if there is a net balance of motion out of the frame
+  // (zoom in). The range for this_frame_mv_in_out is -1.0 to +1.0.
+  if (this_frame_mv_in_out > 0.0)
+    frame_boost += frame_boost * (this_frame_mv_in_out * 2.0);
+  // In the extreme case the boost is halved.
+  else
+    frame_boost += frame_boost * (this_frame_mv_in_out / 2.0);
+
+  return MIN(frame_boost, max_boost * boost_q_correction);
+}
+
+static int calc_arf_boost(VP9_COMP *cpi, int offset,
+                          int f_frames, int b_frames,
+                          int *f_boost, int *b_boost) {
+  TWO_PASS *const twopass = &cpi->twopass;
+  int i;
+  double boost_score = 0.0;
+  double mv_ratio_accumulator = 0.0;
+  double decay_accumulator = 1.0;
+  double this_frame_mv_in_out = 0.0;
+  double mv_in_out_accumulator = 0.0;
+  double abs_mv_in_out_accumulator = 0.0;
+  int arf_boost;
+  int flash_detected = 0;
+
+  // Search forward from the proposed arf/next gf position.
+  for (i = 0; i < f_frames; ++i) {
+    const FIRSTPASS_STATS *this_frame = read_frame_stats(twopass, i + offset);
+    if (this_frame == NULL)
+      break;
+
+    // Update the motion related elements to the boost calculation.
+    accumulate_frame_motion_stats(this_frame,
+                                  &this_frame_mv_in_out, &mv_in_out_accumulator,
+                                  &abs_mv_in_out_accumulator,
+                                  &mv_ratio_accumulator);
+
+    // We want to discount the flash frame itself and the recovery
+    // frame that follows as both will have poor scores.
+    flash_detected = detect_flash(twopass, i + offset) ||
+                     detect_flash(twopass, i + offset + 1);
+
+    // Accumulate the effect of prediction quality decay.
+    if (!flash_detected) {
+      decay_accumulator *= get_prediction_decay_rate(cpi, this_frame);
+      decay_accumulator = decay_accumulator < MIN_DECAY_FACTOR
+                          ? MIN_DECAY_FACTOR : decay_accumulator;
+    }
+
+    boost_score += decay_accumulator * calc_frame_boost(cpi, this_frame,
+                                                        this_frame_mv_in_out,
+                                                        GF_MAX_BOOST);
+  }
+
+  *f_boost = (int)boost_score;
+
+  // Reset for backward looking loop.
+  boost_score = 0.0;
+  mv_ratio_accumulator = 0.0;
+  decay_accumulator = 1.0;
+  this_frame_mv_in_out = 0.0;
+  mv_in_out_accumulator = 0.0;
+  abs_mv_in_out_accumulator = 0.0;
+
+  // Search backward towards last gf position.
+  for (i = -1; i >= -b_frames; --i) {
+    const FIRSTPASS_STATS *this_frame = read_frame_stats(twopass, i + offset);
+    if (this_frame == NULL)
+      break;
+
+    // Update the motion related elements to the boost calculation.
+    accumulate_frame_motion_stats(this_frame,
+                                  &this_frame_mv_in_out, &mv_in_out_accumulator,
+                                  &abs_mv_in_out_accumulator,
+                                  &mv_ratio_accumulator);
+
+    // We want to discount the the flash frame itself and the recovery
+    // frame that follows as both will have poor scores.
+    flash_detected = detect_flash(twopass, i + offset) ||
+                     detect_flash(twopass, i + offset + 1);
+
+    // Cumulative effect of prediction quality decay.
+    if (!flash_detected) {
+      decay_accumulator *= get_prediction_decay_rate(cpi, this_frame);
+      decay_accumulator = decay_accumulator < MIN_DECAY_FACTOR
+                              ? MIN_DECAY_FACTOR : decay_accumulator;
+    }
+
+    boost_score += decay_accumulator * calc_frame_boost(cpi, this_frame,
+                                                        this_frame_mv_in_out,
+                                                        GF_MAX_BOOST);
+  }
+  *b_boost = (int)boost_score;
+
+  arf_boost = (*f_boost + *b_boost);
+  if (arf_boost < ((b_frames + f_frames) * 20))
+    arf_boost = ((b_frames + f_frames) * 20);
+  arf_boost = MAX(arf_boost, MIN_ARF_GF_BOOST);
+
+  return arf_boost;
+}
+
+// Calculate a section intra ratio used in setting max loop filter.
+static int calculate_section_intra_ratio(const FIRSTPASS_STATS *begin,
+                                         const FIRSTPASS_STATS *end,
+                                         int section_length) {
+  const FIRSTPASS_STATS *s = begin;
+  double intra_error = 0.0;
+  double coded_error = 0.0;
+  int i = 0;
+
+  while (s < end && i < section_length) {
+    intra_error += s->intra_error;
+    coded_error += s->coded_error;
+    ++s;
+    ++i;
+  }
+
+  return (int)(intra_error / DOUBLE_DIVIDE_CHECK(coded_error));
+}
+
+// Calculate the total bits to allocate in this GF/ARF group.
+static int64_t calculate_total_gf_group_bits(VP9_COMP *cpi,
+                                             double gf_group_err) {
+  const RATE_CONTROL *const rc = &cpi->rc;
+  const TWO_PASS *const twopass = &cpi->twopass;
+  const int max_bits = frame_max_bits(rc, &cpi->oxcf);
+  int64_t total_group_bits;
+
+  // Calculate the bits to be allocated to the group as a whole.
+  if ((twopass->kf_group_bits > 0) && (twopass->kf_group_error_left > 0)) {
+    total_group_bits = (int64_t)(twopass->kf_group_bits *
+                                 (gf_group_err / twopass->kf_group_error_left));
+  } else {
+    total_group_bits = 0;
+  }
+
+  // Clamp odd edge cases.
+  total_group_bits = (total_group_bits < 0) ?
+     0 : (total_group_bits > twopass->kf_group_bits) ?
+     twopass->kf_group_bits : total_group_bits;
+
+  // Clip based on user supplied data rate variability limit.
+  if (total_group_bits > (int64_t)max_bits * rc->baseline_gf_interval)
+    total_group_bits = (int64_t)max_bits * rc->baseline_gf_interval;
+
+  return total_group_bits;
+}
+
+// Calculate the number bits extra to assign to boosted frames in a group.
+static int calculate_boost_bits(int frame_count,
+                                int boost, int64_t total_group_bits) {
+  int allocation_chunks;
+
+  // return 0 for invalid inputs (could arise e.g. through rounding errors)
+  if (!boost || (total_group_bits <= 0) || (frame_count <= 0) )
+    return 0;
+
+  allocation_chunks = (frame_count * 100) + boost;
+
+  // Prevent overflow.
+  if (boost > 1023) {
+    int divisor = boost >> 10;
+    boost /= divisor;
+    allocation_chunks /= divisor;
+  }
+
+  // Calculate the number of extra bits for use in the boosted frame or frames.
+  return MAX((int)(((int64_t)boost * total_group_bits) / allocation_chunks), 0);
+}
+
+// Current limit on maximum number of active arfs in a GF/ARF group.
+#define MAX_ACTIVE_ARFS 2
+#define ARF_SLOT1 2
+#define ARF_SLOT2 3
+// This function indirects the choice of buffers for arfs.
+// At the moment the values are fixed but this may change as part of
+// the integration process with other codec features that swap buffers around.
+static void get_arf_buffer_indices(unsigned char *arf_buffer_indices) {
+  arf_buffer_indices[0] = ARF_SLOT1;
+  arf_buffer_indices[1] = ARF_SLOT2;
+}
+
+static void allocate_gf_group_bits(VP9_COMP *cpi, int64_t gf_group_bits,
+                                   double group_error, int gf_arf_bits) {
+  RATE_CONTROL *const rc = &cpi->rc;
+  const VP9EncoderConfig *const oxcf = &cpi->oxcf;
+  TWO_PASS *const twopass = &cpi->twopass;
+  GF_GROUP *const gf_group = &twopass->gf_group;
+  FIRSTPASS_STATS frame_stats;
+  int i;
+  int frame_index = 1;
+  int target_frame_size;
+  int key_frame;
+  const int max_bits = frame_max_bits(&cpi->rc, &cpi->oxcf);
+  int64_t total_group_bits = gf_group_bits;
+  double modified_err = 0.0;
+  double err_fraction;
+  int mid_boost_bits = 0;
+  int mid_frame_idx;
+  unsigned char arf_buffer_indices[MAX_ACTIVE_ARFS];
+  int alt_frame_index = frame_index;
+  int has_temporal_layers = is_two_pass_svc(cpi) &&
+                            cpi->svc.number_temporal_layers > 1;
+
+  // Only encode alt reference frame in temporal base layer.
+  if (has_temporal_layers)
+    alt_frame_index = cpi->svc.number_temporal_layers;
+
+  key_frame = cpi->common.frame_type == KEY_FRAME ||
+              vp9_is_upper_layer_key_frame(cpi);
+
+  get_arf_buffer_indices(arf_buffer_indices);
+
+  // For key frames the frame target rate is already set and it
+  // is also the golden frame.
+  if (!key_frame) {
+    if (rc->source_alt_ref_active) {
+      gf_group->update_type[0] = OVERLAY_UPDATE;
+      gf_group->rf_level[0] = INTER_NORMAL;
+      gf_group->bit_allocation[0] = 0;
+      gf_group->arf_update_idx[0] = arf_buffer_indices[0];
+      gf_group->arf_ref_idx[0] = arf_buffer_indices[0];
+    } else {
+      gf_group->update_type[0] = GF_UPDATE;
+      gf_group->rf_level[0] = GF_ARF_STD;
+      gf_group->bit_allocation[0] = gf_arf_bits;
+      gf_group->arf_update_idx[0] = arf_buffer_indices[0];
+      gf_group->arf_ref_idx[0] = arf_buffer_indices[0];
+    }
+
+    // Step over the golden frame / overlay frame
+    if (EOF == input_stats(twopass, &frame_stats))
+      return;
+  }
+
+  // Deduct the boost bits for arf (or gf if it is not a key frame)
+  // from the group total.
+  if (rc->source_alt_ref_pending || !key_frame)
+    total_group_bits -= gf_arf_bits;
+
+  // Store the bits to spend on the ARF if there is one.
+  if (rc->source_alt_ref_pending) {
+    gf_group->update_type[alt_frame_index] = ARF_UPDATE;
+    gf_group->rf_level[alt_frame_index] = GF_ARF_STD;
+    gf_group->bit_allocation[alt_frame_index] = gf_arf_bits;
+
+    if (has_temporal_layers)
+      gf_group->arf_src_offset[alt_frame_index] =
+          (unsigned char)(rc->baseline_gf_interval -
+                          cpi->svc.number_temporal_layers);
+    else
+      gf_group->arf_src_offset[alt_frame_index] =
+          (unsigned char)(rc->baseline_gf_interval - 1);
+
+    gf_group->arf_update_idx[alt_frame_index] = arf_buffer_indices[0];
+    gf_group->arf_ref_idx[alt_frame_index] =
+      arf_buffer_indices[cpi->multi_arf_last_grp_enabled &&
+                         rc->source_alt_ref_active];
+    if (!has_temporal_layers)
+      ++frame_index;
+
+    if (cpi->multi_arf_enabled) {
+      // Set aside a slot for a level 1 arf.
+      gf_group->update_type[frame_index] = ARF_UPDATE;
+      gf_group->rf_level[frame_index] = GF_ARF_LOW;
+      gf_group->arf_src_offset[frame_index] =
+        (unsigned char)((rc->baseline_gf_interval >> 1) - 1);
+      gf_group->arf_update_idx[frame_index] = arf_buffer_indices[1];
+      gf_group->arf_ref_idx[frame_index] = arf_buffer_indices[0];
+      ++frame_index;
+    }
+  }
+
+  // Define middle frame
+  mid_frame_idx = frame_index + (rc->baseline_gf_interval >> 1) - 1;
+
+  // Allocate bits to the other frames in the group.
+  for (i = 0; i < rc->baseline_gf_interval - rc->source_alt_ref_pending; ++i) {
+    int arf_idx = 0;
+    if (EOF == input_stats(twopass, &frame_stats))
+      break;
+
+    if (has_temporal_layers && frame_index == alt_frame_index) {
+      ++frame_index;
+    }
+
+    modified_err = calculate_modified_err(twopass, oxcf, &frame_stats);
+
+    if (group_error > 0)
+      err_fraction = modified_err / DOUBLE_DIVIDE_CHECK(group_error);
+    else
+      err_fraction = 0.0;
+
+    target_frame_size = (int)((double)total_group_bits * err_fraction);
+
+    if (rc->source_alt_ref_pending && cpi->multi_arf_enabled) {
+      mid_boost_bits += (target_frame_size >> 4);
+      target_frame_size -= (target_frame_size >> 4);
+
+      if (frame_index <= mid_frame_idx)
+        arf_idx = 1;
+    }
+    gf_group->arf_update_idx[frame_index] = arf_buffer_indices[arf_idx];
+    gf_group->arf_ref_idx[frame_index] = arf_buffer_indices[arf_idx];
+
+    target_frame_size = clamp(target_frame_size, 0,
+                              MIN(max_bits, (int)total_group_bits));
+
+    gf_group->update_type[frame_index] = LF_UPDATE;
+    gf_group->rf_level[frame_index] = INTER_NORMAL;
+
+    gf_group->bit_allocation[frame_index] = target_frame_size;
+    ++frame_index;
+  }
+
+  // Note:
+  // We need to configure the frame at the end of the sequence + 1 that will be
+  // the start frame for the next group. Otherwise prior to the call to
+  // vp9_rc_get_second_pass_params() the data will be undefined.
+  gf_group->arf_update_idx[frame_index] = arf_buffer_indices[0];
+  gf_group->arf_ref_idx[frame_index] = arf_buffer_indices[0];
+
+  if (rc->source_alt_ref_pending) {
+    gf_group->update_type[frame_index] = OVERLAY_UPDATE;
+    gf_group->rf_level[frame_index] = INTER_NORMAL;
+
+    // Final setup for second arf and its overlay.
+    if (cpi->multi_arf_enabled) {
+      gf_group->bit_allocation[2] =
+          gf_group->bit_allocation[mid_frame_idx] + mid_boost_bits;
+      gf_group->update_type[mid_frame_idx] = OVERLAY_UPDATE;
+      gf_group->bit_allocation[mid_frame_idx] = 0;
+    }
+  } else {
+    gf_group->update_type[frame_index] = GF_UPDATE;
+    gf_group->rf_level[frame_index] = GF_ARF_STD;
+  }
+
+  // Note whether multi-arf was enabled this group for next time.
+  cpi->multi_arf_last_grp_enabled = cpi->multi_arf_enabled;
+}
+
+// Analyse and define a gf/arf group.
+static void define_gf_group(VP9_COMP *cpi, FIRSTPASS_STATS *this_frame) {
+  VP9_COMMON *const cm = &cpi->common;
+  RATE_CONTROL *const rc = &cpi->rc;
+  VP9EncoderConfig *const oxcf = &cpi->oxcf;
+  TWO_PASS *const twopass = &cpi->twopass;
+  FIRSTPASS_STATS next_frame;
+  const FIRSTPASS_STATS *const start_pos = twopass->stats_in;
+  int i;
+
+  double boost_score = 0.0;
+  double old_boost_score = 0.0;
+  double gf_group_err = 0.0;
+#if GROUP_ADAPTIVE_MAXQ
+  double gf_group_raw_error = 0.0;
+#endif
+  double gf_first_frame_err = 0.0;
+  double mod_frame_err = 0.0;
+
+  double mv_ratio_accumulator = 0.0;
+  double decay_accumulator = 1.0;
+  double zero_motion_accumulator = 1.0;
+
+  double loop_decay_rate = 1.00;
+  double last_loop_decay_rate = 1.00;
+
+  double this_frame_mv_in_out = 0.0;
+  double mv_in_out_accumulator = 0.0;
+  double abs_mv_in_out_accumulator = 0.0;
+  double mv_ratio_accumulator_thresh;
+  unsigned int allow_alt_ref = is_altref_enabled(cpi);
+
+  int f_boost = 0;
+  int b_boost = 0;
+  int flash_detected;
+  int active_max_gf_interval;
+  int active_min_gf_interval;
+  int64_t gf_group_bits;
+  double gf_group_error_left;
+  int gf_arf_bits;
+  int is_key_frame = frame_is_intra_only(cm);
+
+  // Reset the GF group data structures unless this is a key
+  // frame in which case it will already have been done.
+  if (is_key_frame == 0) {
+    vp9_zero(twopass->gf_group);
+  }
+
+  vp9_clear_system_state();
+  vp9_zero(next_frame);
+
+  // Load stats for the current frame.
+  mod_frame_err = calculate_modified_err(twopass, oxcf, this_frame);
+
+  // Note the error of the frame at the start of the group. This will be
+  // the GF frame error if we code a normal gf.
+  gf_first_frame_err = mod_frame_err;
+
+  // If this is a key frame or the overlay from a previous arf then
+  // the error score / cost of this frame has already been accounted for.
+  if (is_key_frame || rc->source_alt_ref_active) {
+    gf_group_err -= gf_first_frame_err;
+#if GROUP_ADAPTIVE_MAXQ
+    gf_group_raw_error -= this_frame->coded_error;
+#endif
+  }
+
+  // Motion breakout threshold for loop below depends on image size.
+  mv_ratio_accumulator_thresh =
+      (cpi->initial_height + cpi->initial_width) / 4.0;
+
+  // Set a maximum and minimum interval for the GF group.
+  // If the image appears almost completely static we can extend beyond this.
+  {
+    int int_max_q =
+      (int)(vp9_convert_qindex_to_q(twopass->active_worst_quality,
+                                   cpi->common.bit_depth));
+    int int_lbq =
+      (int)(vp9_convert_qindex_to_q(rc->last_boosted_qindex,
+                                   cpi->common.bit_depth));
+    active_min_gf_interval = rc->min_gf_interval + MIN(2, int_max_q / 200);
+    if (active_min_gf_interval > rc->max_gf_interval)
+      active_min_gf_interval = rc->max_gf_interval;
+
+    if (cpi->multi_arf_allowed) {
+      active_max_gf_interval = rc->max_gf_interval;
+    } else {
+      // The value chosen depends on the active Q range. At low Q we have
+      // bits to spare and are better with a smaller interval and smaller boost.
+      // At high Q when there are few bits to spare we are better with a longer
+      // interval to spread the cost of the GF.
+      active_max_gf_interval = 12 + MIN(4, (int_lbq / 6));
+      if (active_max_gf_interval > rc->max_gf_interval)
+        active_max_gf_interval = rc->max_gf_interval;
+      if (active_max_gf_interval < active_min_gf_interval)
+        active_max_gf_interval = active_min_gf_interval;
+    }
+  }
+
+  i = 0;
+  while (i < rc->static_scene_max_gf_interval && i < rc->frames_to_key) {
+    ++i;
+
+    // Accumulate error score of frames in this gf group.
+    mod_frame_err = calculate_modified_err(twopass, oxcf, this_frame);
+    gf_group_err += mod_frame_err;
+#if GROUP_ADAPTIVE_MAXQ
+    gf_group_raw_error += this_frame->coded_error;
+#endif
+
+    if (EOF == input_stats(twopass, &next_frame))
+      break;
+
+    // Test for the case where there is a brief flash but the prediction
+    // quality back to an earlier frame is then restored.
+    flash_detected = detect_flash(twopass, 0);
+
+    // Update the motion related elements to the boost calculation.
+    accumulate_frame_motion_stats(&next_frame,
+                                  &this_frame_mv_in_out, &mv_in_out_accumulator,
+                                  &abs_mv_in_out_accumulator,
+                                  &mv_ratio_accumulator);
+
+    // Accumulate the effect of prediction quality decay.
+    if (!flash_detected) {
+      last_loop_decay_rate = loop_decay_rate;
+      loop_decay_rate = get_prediction_decay_rate(cpi, &next_frame);
+
+      decay_accumulator = decay_accumulator * loop_decay_rate;
+
+      // Monitor for static sections.
+      zero_motion_accumulator =
+        MIN(zero_motion_accumulator, get_zero_motion_factor(cpi, &next_frame));
+
+      // Break clause to detect very still sections after motion. For example,
+      // a static image after a fade or other transition.
+      if (detect_transition_to_still(cpi, i, 5, loop_decay_rate,
+                                     last_loop_decay_rate)) {
+        allow_alt_ref = 0;
+        break;
+      }
+    }
+
+    // Calculate a boost number for this frame.
+    boost_score += decay_accumulator * calc_frame_boost(cpi, &next_frame,
+                                                        this_frame_mv_in_out,
+                                                        GF_MAX_BOOST);
+
+    // Break out conditions.
+    if (
+      // Break at active_max_gf_interval unless almost totally static.
+      (i >= active_max_gf_interval && (zero_motion_accumulator < 0.995)) ||
+      (
+        // Don't break out with a very short interval.
+        (i > active_min_gf_interval) &&
+        (!flash_detected) &&
+        ((mv_ratio_accumulator > mv_ratio_accumulator_thresh) ||
+         (abs_mv_in_out_accumulator > 3.0) ||
+         (mv_in_out_accumulator < -2.0) ||
+         ((boost_score - old_boost_score) < BOOST_BREAKOUT)))) {
+      boost_score = old_boost_score;
+      break;
+    }
+
+    *this_frame = next_frame;
+    old_boost_score = boost_score;
+  }
+
+  twopass->gf_zeromotion_pct = (int)(zero_motion_accumulator * 1000.0);
+
+  // Was the group length constrained by the requirement for a new KF?
+  rc->constrained_gf_group = (i >= rc->frames_to_key) ? 1 : 0;
+
+  // Should we use the alternate reference frame.
+  if (allow_alt_ref &&
+    (i < cpi->oxcf.lag_in_frames) &&
+    (i >= rc->min_gf_interval)) {
+    // Calculate the boost for alt ref.
+    rc->gfu_boost = calc_arf_boost(cpi, 0, (i - 1), (i - 1), &f_boost,
+      &b_boost);
+    rc->source_alt_ref_pending = 1;
+
+    // Test to see if multi arf is appropriate.
+    cpi->multi_arf_enabled =
+      (cpi->multi_arf_allowed && (rc->baseline_gf_interval >= 6) &&
+      (zero_motion_accumulator < 0.995)) ? 1 : 0;
+  } else {
+    rc->gfu_boost = MAX((int)boost_score, MIN_ARF_GF_BOOST);
+    rc->source_alt_ref_pending = 0;
+  }
+
+  // Set the interval until the next gf.
+  if (is_key_frame || rc->source_alt_ref_pending)
+    rc->baseline_gf_interval = i - 1;
+  else
+    rc->baseline_gf_interval = i;
+
+  // Only encode alt reference frame in temporal base layer. So
+  // baseline_gf_interval should be multiple of a temporal layer group
+  // (typically the frame distance between two base layer frames)
+  if (is_two_pass_svc(cpi) && cpi->svc.number_temporal_layers > 1) {
+    int count = (1 << (cpi->svc.number_temporal_layers - 1)) - 1;
+    int new_gf_interval = (rc->baseline_gf_interval + count) & (~count);
+    int j;
+    for (j = 0; j < new_gf_interval - rc->baseline_gf_interval; ++j) {
+      if (EOF == input_stats(twopass, this_frame))
+        break;
+      gf_group_err += calculate_modified_err(twopass, oxcf, this_frame);
+#if GROUP_ADAPTIVE_MAXQ
+      gf_group_raw_error += this_frame->coded_error;
+#endif
+    }
+    rc->baseline_gf_interval = new_gf_interval;
+  }
+
+  rc->frames_till_gf_update_due = rc->baseline_gf_interval;
+
+  // Reset the file position.
+  reset_fpf_position(twopass, start_pos);
+
+  // Calculate the bits to be allocated to the gf/arf group as a whole
+  gf_group_bits = calculate_total_gf_group_bits(cpi, gf_group_err);
+
+#if GROUP_ADAPTIVE_MAXQ
+  // Calculate an estimate of the maxq needed for the group.
+  // We are more agressive about correcting for sections
+  // where there could be significant overshoot than for easier
+  // sections where we do not wish to risk creating an overshoot
+  // of the allocated bit budget.
+  if ((cpi->oxcf.rc_mode != VPX_Q) && (rc->baseline_gf_interval > 1)) {
+    const int vbr_group_bits_per_frame =
+      (int)(gf_group_bits / rc->baseline_gf_interval);
+    const double group_av_err = gf_group_raw_error  / rc->baseline_gf_interval;
+    int tmp_q;
+    // rc factor is a weight factor that corrects for local rate control drift.
+    double rc_factor = 1.0;
+    if (rc->rate_error_estimate > 0) {
+      rc_factor = MAX(RC_FACTOR_MIN,
+                      (double)(100 - rc->rate_error_estimate) / 100.0);
+    } else {
+      rc_factor = MIN(RC_FACTOR_MAX,
+                      (double)(100 - rc->rate_error_estimate) / 100.0);
+    }
+    tmp_q =
+      get_twopass_worst_quality(cpi, group_av_err, vbr_group_bits_per_frame,
+                                twopass->kfgroup_inter_fraction * rc_factor);
+    twopass->active_worst_quality =
+      MAX(tmp_q, twopass->active_worst_quality >> 1);
+  }
+#endif
+
+  // Calculate the extra bits to be used for boosted frame(s)
+  gf_arf_bits = calculate_boost_bits(rc->baseline_gf_interval,
+                                     rc->gfu_boost, gf_group_bits);
+
+  // Adjust KF group bits and error remaining.
+  twopass->kf_group_error_left -= (int64_t)gf_group_err;
+
+  // If this is an arf update we want to remove the score for the overlay
+  // frame at the end which will usually be very cheap to code.
+  // The overlay frame has already, in effect, been coded so we want to spread
+  // the remaining bits among the other frames.
+  // For normal GFs remove the score for the GF itself unless this is
+  // also a key frame in which case it has already been accounted for.
+  if (rc->source_alt_ref_pending) {
+    gf_group_error_left = gf_group_err - mod_frame_err;
+  } else if (is_key_frame == 0) {
+    gf_group_error_left = gf_group_err - gf_first_frame_err;
+  } else {
+    gf_group_error_left = gf_group_err;
+  }
+
+  // Allocate bits to each of the frames in the GF group.
+  allocate_gf_group_bits(cpi, gf_group_bits, gf_group_error_left, gf_arf_bits);
+
+  // Reset the file position.
+  reset_fpf_position(twopass, start_pos);
+
+  // Calculate a section intra ratio used in setting max loop filter.
+  if (cpi->common.frame_type != KEY_FRAME) {
+    twopass->section_intra_rating =
+        calculate_section_intra_ratio(start_pos, twopass->stats_in_end,
+                                      rc->baseline_gf_interval);
+  }
+
+  if (oxcf->resize_mode == RESIZE_DYNAMIC) {
+    // Default to starting GF groups at normal frame size.
+    cpi->rc.next_frame_size_selector = UNSCALED;
+  }
+}
+
+// Threshold for use of the lagging second reference frame. High second ref
+// usage may point to a transient event like a flash or occlusion rather than
+// a real scene cut.
+#define SECOND_REF_USEAGE_THRESH 0.1
+// Minimum % intra coding observed in first pass (1.0 = 100%)
+#define MIN_INTRA_LEVEL 0.25
+// Minimum ratio between the % of intra coding and inter coding in the first
+// pass after discounting neutral blocks (discounting neutral blocks in this
+// way helps catch scene cuts in clips with very flat areas or letter box
+// format clips with image padding.
+#define INTRA_VS_INTER_THRESH 2.0
+// Hard threshold where the first pass chooses intra for almost all blocks.
+// In such a case even if the frame is not a scene cut coding a key frame
+// may be a good option.
+#define VERY_LOW_INTER_THRESH 0.05
+// Maximum threshold for the relative ratio of intra error score vs best
+// inter error score.
+#define KF_II_ERR_THRESHOLD 2.5
+// In real scene cuts there is almost always a sharp change in the intra
+// or inter error score.
+#define ERR_CHANGE_THRESHOLD 0.4
+// For real scene cuts we expect an improvment in the intra inter error
+// ratio in the next frame.
+#define II_IMPROVEMENT_THRESHOLD 3.5
+#define KF_II_MAX 128.0
+
+static int test_candidate_kf(TWO_PASS *twopass,
+                             const FIRSTPASS_STATS *last_frame,
+                             const FIRSTPASS_STATS *this_frame,
+                             const FIRSTPASS_STATS *next_frame) {
+  int is_viable_kf = 0;
+  double pcnt_intra = 1.0 - this_frame->pcnt_inter;
+  double modified_pcnt_inter =
+    this_frame->pcnt_inter - this_frame->pcnt_neutral;
+
+  // Does the frame satisfy the primary criteria of a key frame?
+  // See above for an explanation of the test criteria.
+  // If so, then examine how well it predicts subsequent frames.
+  if ((this_frame->pcnt_second_ref < SECOND_REF_USEAGE_THRESH) &&
+      (next_frame->pcnt_second_ref < SECOND_REF_USEAGE_THRESH) &&
+      ((this_frame->pcnt_inter < VERY_LOW_INTER_THRESH) ||
+       ((pcnt_intra > MIN_INTRA_LEVEL) &&
+        (pcnt_intra > (INTRA_VS_INTER_THRESH * modified_pcnt_inter)) &&
+        ((this_frame->intra_error /
+          DOUBLE_DIVIDE_CHECK(this_frame->coded_error)) <
+          KF_II_ERR_THRESHOLD) &&
+        ((fabs(last_frame->coded_error - this_frame->coded_error) /
+          DOUBLE_DIVIDE_CHECK(this_frame->coded_error) >
+          ERR_CHANGE_THRESHOLD) ||
+         (fabs(last_frame->intra_error - this_frame->intra_error) /
+          DOUBLE_DIVIDE_CHECK(this_frame->intra_error) >
+          ERR_CHANGE_THRESHOLD) ||
+         ((next_frame->intra_error /
+          DOUBLE_DIVIDE_CHECK(next_frame->coded_error)) >
+          II_IMPROVEMENT_THRESHOLD))))) {
+    int i;
+    const FIRSTPASS_STATS *start_pos = twopass->stats_in;
+    FIRSTPASS_STATS local_next_frame = *next_frame;
+    double boost_score = 0.0;
+    double old_boost_score = 0.0;
+    double decay_accumulator = 1.0;
+
+    // Examine how well the key frame predicts subsequent frames.
+    for (i = 0; i < 16; ++i) {
+      double next_iiratio = (BOOST_FACTOR * local_next_frame.intra_error /
+                             DOUBLE_DIVIDE_CHECK(local_next_frame.coded_error));
+
+      if (next_iiratio > KF_II_MAX)
+        next_iiratio = KF_II_MAX;
+
+      // Cumulative effect of decay in prediction quality.
+      if (local_next_frame.pcnt_inter > 0.85)
+        decay_accumulator *= local_next_frame.pcnt_inter;
+      else
+        decay_accumulator *= (0.85 + local_next_frame.pcnt_inter) / 2.0;
+
+      // Keep a running total.
+      boost_score += (decay_accumulator * next_iiratio);
+
+      // Test various breakout clauses.
+      if ((local_next_frame.pcnt_inter < 0.05) ||
+          (next_iiratio < 1.5) ||
+          (((local_next_frame.pcnt_inter -
+             local_next_frame.pcnt_neutral) < 0.20) &&
+           (next_iiratio < 3.0)) ||
+          ((boost_score - old_boost_score) < 3.0) ||
+          (local_next_frame.intra_error < 200)) {
+        break;
+      }
+
+      old_boost_score = boost_score;
+
+      // Get the next frame details
+      if (EOF == input_stats(twopass, &local_next_frame))
+        break;
+    }
+
+    // If there is tolerable prediction for at least the next 3 frames then
+    // break out else discard this potential key frame and move on
+    if (boost_score > 30.0 && (i > 3)) {
+      is_viable_kf = 1;
+    } else {
+      // Reset the file position
+      reset_fpf_position(twopass, start_pos);
+
+      is_viable_kf = 0;
+    }
+  }
+
+  return is_viable_kf;
+}
+
+static void find_next_key_frame(VP9_COMP *cpi, FIRSTPASS_STATS *this_frame) {
+  int i, j;
+  RATE_CONTROL *const rc = &cpi->rc;
+  TWO_PASS *const twopass = &cpi->twopass;
+  GF_GROUP *const gf_group = &twopass->gf_group;
+  const VP9EncoderConfig *const oxcf = &cpi->oxcf;
+  const FIRSTPASS_STATS first_frame = *this_frame;
+  const FIRSTPASS_STATS *const start_position = twopass->stats_in;
+  FIRSTPASS_STATS next_frame;
+  FIRSTPASS_STATS last_frame;
+  int kf_bits = 0;
+  int loop_decay_counter = 0;
+  double decay_accumulator = 1.0;
+  double av_decay_accumulator = 0.0;
+  double zero_motion_accumulator = 1.0;
+  double boost_score = 0.0;
+  double kf_mod_err = 0.0;
+  double kf_group_err = 0.0;
+  double recent_loop_decay[8] = {1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0};
+
+  vp9_zero(next_frame);
+
+  cpi->common.frame_type = KEY_FRAME;
+
+  // Reset the GF group data structures.
+  vp9_zero(*gf_group);
+
+  // Is this a forced key frame by interval.
+  rc->this_key_frame_forced = rc->next_key_frame_forced;
+
+  // Clear the alt ref active flag and last group multi arf flags as they
+  // can never be set for a key frame.
+  rc->source_alt_ref_active = 0;
+  cpi->multi_arf_last_grp_enabled = 0;
+
+  // KF is always a GF so clear frames till next gf counter.
+  rc->frames_till_gf_update_due = 0;
+
+  rc->frames_to_key = 1;
+
+  twopass->kf_group_bits = 0;        // Total bits available to kf group
+  twopass->kf_group_error_left = 0;  // Group modified error score.
+
+  kf_mod_err = calculate_modified_err(twopass, oxcf, this_frame);
+
+  // Find the next keyframe.
+  i = 0;
+  while (twopass->stats_in < twopass->stats_in_end &&
+         rc->frames_to_key < cpi->oxcf.key_freq) {
+    // Accumulate kf group error.
+    kf_group_err += calculate_modified_err(twopass, oxcf, this_frame);
+
+    // Load the next frame's stats.
+    last_frame = *this_frame;
+    input_stats(twopass, this_frame);
+
+    // Provided that we are not at the end of the file...
+    if (cpi->oxcf.auto_key && twopass->stats_in < twopass->stats_in_end) {
+      double loop_decay_rate;
+
+      // Check for a scene cut.
+      if (test_candidate_kf(twopass, &last_frame, this_frame,
+                            twopass->stats_in))
+        break;
+
+      // How fast is the prediction quality decaying?
+      loop_decay_rate = get_prediction_decay_rate(cpi, twopass->stats_in);
+
+      // We want to know something about the recent past... rather than
+      // as used elsewhere where we are concerned with decay in prediction
+      // quality since the last GF or KF.
+      recent_loop_decay[i % 8] = loop_decay_rate;
+      decay_accumulator = 1.0;
+      for (j = 0; j < 8; ++j)
+        decay_accumulator *= recent_loop_decay[j];
+
+      // Special check for transition or high motion followed by a
+      // static scene.
+      if (detect_transition_to_still(cpi, i, cpi->oxcf.key_freq - i,
+                                     loop_decay_rate, decay_accumulator))
+        break;
+
+      // Step on to the next frame.
+      ++rc->frames_to_key;
+
+      // If we don't have a real key frame within the next two
+      // key_freq intervals then break out of the loop.
+      if (rc->frames_to_key >= 2 * cpi->oxcf.key_freq)
+        break;
+    } else {
+      ++rc->frames_to_key;
+    }
+    ++i;
+  }
+
+  // If there is a max kf interval set by the user we must obey it.
+  // We already breakout of the loop above at 2x max.
+  // This code centers the extra kf if the actual natural interval
+  // is between 1x and 2x.
+  if (cpi->oxcf.auto_key &&
+      rc->frames_to_key > cpi->oxcf.key_freq) {
+    FIRSTPASS_STATS tmp_frame = first_frame;
+
+    rc->frames_to_key /= 2;
+
+    // Reset to the start of the group.
+    reset_fpf_position(twopass, start_position);
+
+    kf_group_err = 0.0;
+
+    // Rescan to get the correct error data for the forced kf group.
+    for (i = 0; i < rc->frames_to_key; ++i) {
+      kf_group_err += calculate_modified_err(twopass, oxcf, &tmp_frame);
+      input_stats(twopass, &tmp_frame);
+    }
+    rc->next_key_frame_forced = 1;
+  } else if (twopass->stats_in == twopass->stats_in_end ||
+             rc->frames_to_key >= cpi->oxcf.key_freq) {
+    rc->next_key_frame_forced = 1;
+  } else {
+    rc->next_key_frame_forced = 0;
+  }
+
+  if (is_two_pass_svc(cpi) && cpi->svc.number_temporal_layers > 1) {
+    int count = (1 << (cpi->svc.number_temporal_layers - 1)) - 1;
+    int new_frame_to_key = (rc->frames_to_key + count) & (~count);
+    int j;
+    for (j = 0; j < new_frame_to_key - rc->frames_to_key; ++j) {
+      if (EOF == input_stats(twopass, this_frame))
+        break;
+      kf_group_err += calculate_modified_err(twopass, oxcf, this_frame);
+    }
+    rc->frames_to_key = new_frame_to_key;
+  }
+
+  // Special case for the last key frame of the file.
+  if (twopass->stats_in >= twopass->stats_in_end) {
+    // Accumulate kf group error.
+    kf_group_err += calculate_modified_err(twopass, oxcf, this_frame);
+  }
+
+  // Calculate the number of bits that should be assigned to the kf group.
+  if (twopass->bits_left > 0 && twopass->modified_error_left > 0.0) {
+    // Maximum number of bits for a single normal frame (not key frame).
+    const int max_bits = frame_max_bits(rc, &cpi->oxcf);
+
+    // Maximum number of bits allocated to the key frame group.
+    int64_t max_grp_bits;
+
+    // Default allocation based on bits left and relative
+    // complexity of the section.
+    twopass->kf_group_bits = (int64_t)(twopass->bits_left *
+       (kf_group_err / twopass->modified_error_left));
+
+    // Clip based on maximum per frame rate defined by the user.
+    max_grp_bits = (int64_t)max_bits * (int64_t)rc->frames_to_key;
+    if (twopass->kf_group_bits > max_grp_bits)
+      twopass->kf_group_bits = max_grp_bits;
+  } else {
+    twopass->kf_group_bits = 0;
+  }
+  twopass->kf_group_bits = MAX(0, twopass->kf_group_bits);
+
+  // Reset the first pass file position.
+  reset_fpf_position(twopass, start_position);
+
+  // Scan through the kf group collating various stats used to determine
+  // how many bits to spend on it.
+  decay_accumulator = 1.0;
+  boost_score = 0.0;
+  for (i = 0; i < (rc->frames_to_key - 1); ++i) {
+    if (EOF == input_stats(twopass, &next_frame))
+      break;
+
+    // Monitor for static sections.
+    zero_motion_accumulator =
+      MIN(zero_motion_accumulator,
+          get_zero_motion_factor(cpi, &next_frame));
+
+    // Not all frames in the group are necessarily used in calculating boost.
+    if ((i <= rc->max_gf_interval) ||
+        ((i <= (rc->max_gf_interval * 4)) && (decay_accumulator > 0.5))) {
+      const double frame_boost =
+        calc_frame_boost(cpi, this_frame, 0, KF_MAX_BOOST);
+
+      // How fast is prediction quality decaying.
+      if (!detect_flash(twopass, 0)) {
+        const double loop_decay_rate =
+          get_prediction_decay_rate(cpi, &next_frame);
+        decay_accumulator *= loop_decay_rate;
+        decay_accumulator = MAX(decay_accumulator, MIN_DECAY_FACTOR);
+        av_decay_accumulator += decay_accumulator;
+        ++loop_decay_counter;
+      }
+      boost_score += (decay_accumulator * frame_boost);
+    }
+  }
+  av_decay_accumulator /= (double)loop_decay_counter;
+
+  reset_fpf_position(twopass, start_position);
+
+  // Store the zero motion percentage
+  twopass->kf_zeromotion_pct = (int)(zero_motion_accumulator * 100.0);
+
+  // Calculate a section intra ratio used in setting max loop filter.
+  twopass->section_intra_rating =
+      calculate_section_intra_ratio(start_position, twopass->stats_in_end,
+                                    rc->frames_to_key);
+
+  // Apply various clamps for min and max boost
+  rc->kf_boost = (int)(av_decay_accumulator * boost_score);
+  rc->kf_boost = MAX(rc->kf_boost, (rc->frames_to_key * 3));
+  rc->kf_boost = MAX(rc->kf_boost, MIN_KF_BOOST);
+
+  // Work out how many bits to allocate for the key frame itself.
+  kf_bits = calculate_boost_bits((rc->frames_to_key - 1),
+                                  rc->kf_boost, twopass->kf_group_bits);
+
+  // Work out the fraction of the kf group bits reserved for the inter frames
+  // within the group after discounting the bits for the kf itself.
+  if (twopass->kf_group_bits) {
+    twopass->kfgroup_inter_fraction =
+      (double)(twopass->kf_group_bits - kf_bits) /
+      (double)twopass->kf_group_bits;
+  } else {
+    twopass->kfgroup_inter_fraction = 1.0;
+  }
+
+  twopass->kf_group_bits -= kf_bits;
+
+  // Save the bits to spend on the key frame.
+  gf_group->bit_allocation[0] = kf_bits;
+  gf_group->update_type[0] = KF_UPDATE;
+  gf_group->rf_level[0] = KF_STD;
+
+  // Note the total error score of the kf group minus the key frame itself.
+  twopass->kf_group_error_left = (int)(kf_group_err - kf_mod_err);
+
+  // Adjust the count of total modified error left.
+  // The count of bits left is adjusted elsewhere based on real coded frame
+  // sizes.
+  twopass->modified_error_left -= kf_group_err;
+
+  if (oxcf->resize_mode == RESIZE_DYNAMIC) {
+    // Default to normal-sized frame on keyframes.
+    cpi->rc.next_frame_size_selector = UNSCALED;
+  }
+}
+
+// Define the reference buffers that will be updated post encode.
+static void configure_buffer_updates(VP9_COMP *cpi) {
+  TWO_PASS *const twopass = &cpi->twopass;
+
+  cpi->rc.is_src_frame_alt_ref = 0;
+  switch (twopass->gf_group.update_type[twopass->gf_group.index]) {
+    case KF_UPDATE:
+      cpi->refresh_last_frame = 1;
+      cpi->refresh_golden_frame = 1;
+      cpi->refresh_alt_ref_frame = 1;
+      break;
+    case LF_UPDATE:
+      cpi->refresh_last_frame = 1;
+      cpi->refresh_golden_frame = 0;
+      cpi->refresh_alt_ref_frame = 0;
+      break;
+    case GF_UPDATE:
+      cpi->refresh_last_frame = 1;
+      cpi->refresh_golden_frame = 1;
+      cpi->refresh_alt_ref_frame = 0;
+      break;
+    case OVERLAY_UPDATE:
+      cpi->refresh_last_frame = 0;
+      cpi->refresh_golden_frame = 1;
+      cpi->refresh_alt_ref_frame = 0;
+      cpi->rc.is_src_frame_alt_ref = 1;
+      break;
+    case ARF_UPDATE:
+      cpi->refresh_last_frame = 0;
+      cpi->refresh_golden_frame = 0;
+      cpi->refresh_alt_ref_frame = 1;
+      break;
+    default:
+      assert(0);
+      break;
+  }
+  if (is_two_pass_svc(cpi)) {
+    if (cpi->svc.temporal_layer_id > 0) {
+      cpi->refresh_last_frame = 0;
+      cpi->refresh_golden_frame = 0;
+    }
+    if (cpi->svc.layer_context[cpi->svc.spatial_layer_id].gold_ref_idx < 0)
+      cpi->refresh_golden_frame = 0;
+    if (cpi->alt_ref_source == NULL)
+      cpi->refresh_alt_ref_frame = 0;
+  }
+}
+
+static int is_skippable_frame(const VP9_COMP *cpi) {
+  // If the current frame does not have non-zero motion vector detected in the
+  // first  pass, and so do its previous and forward frames, then this frame
+  // can be skipped for partition check, and the partition size is assigned
+  // according to the variance
+  const SVC *const svc = &cpi->svc;
+  const TWO_PASS *const twopass = is_two_pass_svc(cpi) ?
+      &svc->layer_context[svc->spatial_layer_id].twopass : &cpi->twopass;
+
+  return (!frame_is_intra_only(&cpi->common) &&
+    twopass->stats_in - 2 > twopass->stats_in_start &&
+    twopass->stats_in < twopass->stats_in_end &&
+    (twopass->stats_in - 1)->pcnt_inter - (twopass->stats_in - 1)->pcnt_motion
+    == 1 &&
+    (twopass->stats_in - 2)->pcnt_inter - (twopass->stats_in - 2)->pcnt_motion
+    == 1 &&
+    twopass->stats_in->pcnt_inter - twopass->stats_in->pcnt_motion == 1);
+}
+
+void vp9_rc_get_second_pass_params(VP9_COMP *cpi) {
+  VP9_COMMON *const cm = &cpi->common;
+  RATE_CONTROL *const rc = &cpi->rc;
+  TWO_PASS *const twopass = &cpi->twopass;
+  GF_GROUP *const gf_group = &twopass->gf_group;
+  int frames_left;
+  FIRSTPASS_STATS this_frame;
+
+  int target_rate;
+  LAYER_CONTEXT *const lc = is_two_pass_svc(cpi) ?
+        &cpi->svc.layer_context[cpi->svc.spatial_layer_id] : 0;
+
+  if (lc != NULL) {
+    frames_left = (int)(twopass->total_stats.count -
+                  lc->current_video_frame_in_layer);
+  } else {
+    frames_left = (int)(twopass->total_stats.count -
+                  cm->current_video_frame);
+  }
+
+  if (!twopass->stats_in)
+    return;
+
+  // If this is an arf frame then we dont want to read the stats file or
+  // advance the input pointer as we already have what we need.
+  if (gf_group->update_type[gf_group->index] == ARF_UPDATE) {
+    int target_rate;
+    configure_buffer_updates(cpi);
+    target_rate = gf_group->bit_allocation[gf_group->index];
+    target_rate = vp9_rc_clamp_pframe_target_size(cpi, target_rate);
+    rc->base_frame_target = target_rate;
+
+    cm->frame_type = INTER_FRAME;
+
+    if (lc != NULL) {
+      if (cpi->svc.spatial_layer_id == 0) {
+        lc->is_key_frame = 0;
+      } else {
+        lc->is_key_frame = cpi->svc.layer_context[0].is_key_frame;
+
+        if (lc->is_key_frame)
+          cpi->ref_frame_flags &= (~VP9_LAST_FLAG);
+      }
+    }
+
+    // Do the firstpass stats indicate that this frame is skippable for the
+    // partition search?
+    if (cpi->sf.allow_partition_search_skip &&
+        cpi->oxcf.pass == 2 && (!cpi->use_svc || is_two_pass_svc(cpi))) {
+      cpi->partition_search_skippable_frame = is_skippable_frame(cpi);
+    }
+
+    return;
+  }
+
+  vp9_clear_system_state();
+
+  if (cpi->oxcf.rc_mode == VPX_Q) {
+    twopass->active_worst_quality = cpi->oxcf.cq_level;
+  } else if (cm->current_video_frame == 0 ||
+             (lc != NULL && lc->current_video_frame_in_layer == 0)) {
+    // Special case code for first frame.
+    const int section_target_bandwidth = (int)(twopass->bits_left /
+                                               frames_left);
+    const double section_error =
+      twopass->total_left_stats.coded_error / twopass->total_left_stats.count;
+    const int tmp_q =
+      get_twopass_worst_quality(cpi, section_error,
+                                section_target_bandwidth, DEFAULT_GRP_WEIGHT);
+
+    twopass->active_worst_quality = tmp_q;
+    twopass->baseline_active_worst_quality = tmp_q;
+    rc->ni_av_qi = tmp_q;
+    rc->last_q[INTER_FRAME] = tmp_q;
+    rc->avg_q = vp9_convert_qindex_to_q(tmp_q, cm->bit_depth);
+    rc->avg_frame_qindex[INTER_FRAME] = tmp_q;
+    rc->last_q[KEY_FRAME] = (tmp_q + cpi->oxcf.best_allowed_q) / 2;
+    rc->avg_frame_qindex[KEY_FRAME] = rc->last_q[KEY_FRAME];
+  }
+  vp9_zero(this_frame);
+  if (EOF == input_stats(twopass, &this_frame))
+    return;
+
+  // Keyframe and section processing.
+  if (rc->frames_to_key == 0 || (cpi->frame_flags & FRAMEFLAGS_KEY)) {
+    FIRSTPASS_STATS this_frame_copy;
+    this_frame_copy = this_frame;
+    // Define next KF group and assign bits to it.
+    find_next_key_frame(cpi, &this_frame);
+    this_frame = this_frame_copy;
+  } else {
+    cm->frame_type = INTER_FRAME;
+  }
+
+  if (lc != NULL) {
+    if (cpi->svc.spatial_layer_id == 0) {
+      lc->is_key_frame = (cm->frame_type == KEY_FRAME);
+      if (lc->is_key_frame) {
+        cpi->ref_frame_flags &=
+            (~VP9_LAST_FLAG & ~VP9_GOLD_FLAG & ~VP9_ALT_FLAG);
+        lc->frames_from_key_frame = 0;
+        // Encode an intra only empty frame since we have a key frame.
+        cpi->svc.encode_intra_empty_frame = 1;
+      }
+    } else {
+      cm->frame_type = INTER_FRAME;
+      lc->is_key_frame = cpi->svc.layer_context[0].is_key_frame;
+
+      if (lc->is_key_frame) {
+        cpi->ref_frame_flags &= (~VP9_LAST_FLAG);
+        lc->frames_from_key_frame = 0;
+      }
+    }
+  }
+
+  // Define a new GF/ARF group. (Should always enter here for key frames).
+  if (rc->frames_till_gf_update_due == 0) {
+    define_gf_group(cpi, &this_frame);
+
+    rc->frames_till_gf_update_due = rc->baseline_gf_interval;
+    if (lc != NULL)
+      cpi->refresh_golden_frame = 1;
+
+#if ARF_STATS_OUTPUT
+    {
+      FILE *fpfile;
+      fpfile = fopen("arf.stt", "a");
+      ++arf_count;
+      fprintf(fpfile, "%10d %10ld %10d %10d %10ld\n",
+              cm->current_video_frame, rc->frames_till_gf_update_due,
+              rc->kf_boost, arf_count, rc->gfu_boost);
+
+      fclose(fpfile);
+    }
+#endif
+  }
+
+  configure_buffer_updates(cpi);
+
+  // Do the firstpass stats indicate that this frame is skippable for the
+  // partition search?
+  if (cpi->sf.allow_partition_search_skip && cpi->oxcf.pass == 2 &&
+      (!cpi->use_svc || is_two_pass_svc(cpi))) {
+    cpi->partition_search_skippable_frame = is_skippable_frame(cpi);
+  }
+
+  target_rate = gf_group->bit_allocation[gf_group->index];
+  if (cpi->common.frame_type == KEY_FRAME)
+    target_rate = vp9_rc_clamp_iframe_target_size(cpi, target_rate);
+  else
+    target_rate = vp9_rc_clamp_pframe_target_size(cpi, target_rate);
+
+  rc->base_frame_target = target_rate;
+
+  {
+    const int num_mbs = (cpi->oxcf.resize_mode != RESIZE_NONE)
+                        ? cpi->initial_mbs : cpi->common.MBs;
+    // The multiplication by 256 reverses a scaling factor of (>> 8)
+    // applied when combining MB error values for the frame.
+    twopass->mb_av_energy =
+      log(((this_frame.intra_error * 256.0) / num_mbs) + 1.0);
+  }
+
+  // Update the total stats remaining structure.
+  subtract_stats(&twopass->total_left_stats, &this_frame);
+}
+
+#define MINQ_ADJ_LIMIT 48
+#define MINQ_ADJ_LIMIT_CQ 20
+#define HIGH_UNDERSHOOT_RATIO 2
+void vp9_twopass_postencode_update(VP9_COMP *cpi) {
+  TWO_PASS *const twopass = &cpi->twopass;
+  RATE_CONTROL *const rc = &cpi->rc;
+  const int bits_used = rc->base_frame_target;
+
+  // VBR correction is done through rc->vbr_bits_off_target. Based on the
+  // sign of this value, a limited % adjustment is made to the target rate
+  // of subsequent frames, to try and push it back towards 0. This method
+  // is designed to prevent extreme behaviour at the end of a clip
+  // or group of frames.
+  rc->vbr_bits_off_target += rc->base_frame_target - rc->projected_frame_size;
+  twopass->bits_left = MAX(twopass->bits_left - bits_used, 0);
+
+  // Calculate the pct rc error.
+  if (rc->total_actual_bits) {
+    rc->rate_error_estimate =
+      (int)((rc->vbr_bits_off_target * 100) / rc->total_actual_bits);
+    rc->rate_error_estimate = clamp(rc->rate_error_estimate, -100, 100);
+  } else {
+    rc->rate_error_estimate = 0;
+  }
+
+  if (cpi->common.frame_type != KEY_FRAME &&
+      !vp9_is_upper_layer_key_frame(cpi)) {
+    twopass->kf_group_bits -= bits_used;
+    twopass->last_kfgroup_zeromotion_pct = twopass->kf_zeromotion_pct;
+  }
+  twopass->kf_group_bits = MAX(twopass->kf_group_bits, 0);
+
+  // Increment the gf group index ready for the next frame.
+  ++twopass->gf_group.index;
+
+  // If the rate control is drifting consider adjustment to min or maxq.
+  if ((cpi->oxcf.rc_mode != VPX_Q) &&
+      (cpi->twopass.gf_zeromotion_pct < VLOW_MOTION_THRESHOLD) &&
+      !cpi->rc.is_src_frame_alt_ref) {
+    const int maxq_adj_limit =
+      rc->worst_quality - twopass->active_worst_quality;
+    const int minq_adj_limit =
+        (cpi->oxcf.rc_mode == VPX_CQ ? MINQ_ADJ_LIMIT_CQ : MINQ_ADJ_LIMIT);
+
+    // Undershoot.
+    if (rc->rate_error_estimate > cpi->oxcf.under_shoot_pct) {
+      --twopass->extend_maxq;
+      if (rc->rolling_target_bits >= rc->rolling_actual_bits)
+        ++twopass->extend_minq;
+    // Overshoot.
+    } else if (rc->rate_error_estimate < -cpi->oxcf.over_shoot_pct) {
+      --twopass->extend_minq;
+      if (rc->rolling_target_bits < rc->rolling_actual_bits)
+        ++twopass->extend_maxq;
+    } else {
+      // Adjustment for extreme local overshoot.
+      if (rc->projected_frame_size > (2 * rc->base_frame_target) &&
+          rc->projected_frame_size > (2 * rc->avg_frame_bandwidth))
+        ++twopass->extend_maxq;
+
+      // Unwind undershoot or overshoot adjustment.
+      if (rc->rolling_target_bits < rc->rolling_actual_bits)
+        --twopass->extend_minq;
+      else if (rc->rolling_target_bits > rc->rolling_actual_bits)
+        --twopass->extend_maxq;
+    }
+
+    twopass->extend_minq = clamp(twopass->extend_minq, 0, minq_adj_limit);
+    twopass->extend_maxq = clamp(twopass->extend_maxq, 0, maxq_adj_limit);
+
+    // If there is a big and undexpected undershoot then feed the extra
+    // bits back in quickly. One situation where this may happen is if a
+    // frame is unexpectedly almost perfectly predicted by the ARF or GF
+    // but not very well predcited by the previous frame.
+    if (!frame_is_kf_gf_arf(cpi) && !cpi->rc.is_src_frame_alt_ref) {
+      int fast_extra_thresh = rc->base_frame_target / HIGH_UNDERSHOOT_RATIO;
+      if (rc->projected_frame_size < fast_extra_thresh) {
+        rc->vbr_bits_off_target_fast +=
+          fast_extra_thresh - rc->projected_frame_size;
+        rc->vbr_bits_off_target_fast =
+          MIN(rc->vbr_bits_off_target_fast, (4 * rc->avg_frame_bandwidth));
+
+        // Fast adaptation of minQ if necessary to use up the extra bits.
+        if (rc->avg_frame_bandwidth) {
+          twopass->extend_minq_fast =
+            (int)(rc->vbr_bits_off_target_fast * 8 / rc->avg_frame_bandwidth);
+        }
+        twopass->extend_minq_fast = MIN(twopass->extend_minq_fast,
+                                        minq_adj_limit - twopass->extend_minq);
+      } else if (rc->vbr_bits_off_target_fast) {
+        twopass->extend_minq_fast = MIN(twopass->extend_minq_fast,
+                                        minq_adj_limit - twopass->extend_minq);
+      } else {
+        twopass->extend_minq_fast = 0;
+      }
+    }
+  }
+}