libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_ratectrl.c

 /*
  *  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.
  */
 
@@ skipping 191 matching lines @@
                               double correction_factor) {
   const int bpm = (int)(vp9_rc_bits_per_mb(frame_kind, q, correction_factor));
 
   // Attempt to retain reasonable accuracy without overflow. The cutoff is
   // chosen such that the maximum product of Bpm and MBs fits 31 bits. The
   // largest Bpm takes 20 bits.
   return (mbs > (1 << 11)) ? (bpm >> BPER_MB_NORMBITS) * mbs
                            : (bpm * mbs) >> BPER_MB_NORMBITS;
 }
 
+int vp9_rc_clamp_pframe_target_size(const VP9_COMP *const cpi, int target) {
+  const RATE_CONTROL *rc = &cpi->rc;
+  const int min_frame_target = MAX(rc->min_frame_bandwidth,
+                                   rc->av_per_frame_bandwidth >> 5);
+  if (target < min_frame_target)
+    target = min_frame_target;
+  if (cpi->refresh_golden_frame && rc->is_src_frame_alt_ref) {
+    // If there is an active ARF at this location use the minimum
+    // bits on this frame even if it is a constructed arf.
+    // The active maximum quantizer insures that an appropriate
+    // number of bits will be spent if needed for constructed ARFs.
+    target = min_frame_target;
+  }
+  // Clip the frame target to the maximum allowed value.
+  if (target > rc->max_frame_bandwidth)
+    target = rc->max_frame_bandwidth;
+  return target;
+}
 
-static void calc_iframe_target_size(VP9_COMP *cpi) {
+int vp9_rc_clamp_iframe_target_size(const VP9_COMP *const cpi, int target) {
+  const RATE_CONTROL *rc = &cpi->rc;
   const VP9_CONFIG *oxcf = &cpi->oxcf;
-  RATE_CONTROL *const rc = &cpi->rc;
-  int target;
-
-  vp9_clear_system_state();  // __asm emms;
-
-  // For 1-pass.
-  if (cpi->pass == 0) {
-    if (cpi->common.current_video_frame == 0) {
-      target = oxcf->starting_buffer_level / 2;
-    } else {
-      // TODO(marpan): Add in adjustment based on Q.
-      // If this keyframe was forced, use a more recent Q estimate.
-      // int Q = (cpi->common.frame_flags & FRAMEFLAGS_KEY) ?
-      //    cpi->rc.avg_frame_qindex : cpi->rc.ni_av_qi;
-      int initial_boost = 32;
-      // Boost depends somewhat on frame rate.
-      int kf_boost = MAX(initial_boost, (int)(2 * cpi->output_framerate - 16));
-      // Adjustment up based on q: need to fix.
-      // kf_boost = kf_boost * kfboost_qadjust(Q) / 100;
-      // Frame separation adjustment (down).
-      if (rc->frames_since_key  < cpi->output_framerate / 2) {
-        kf_boost = (int)(kf_boost * rc->frames_since_key /
-                       (cpi->output_framerate / 2));
-      }
-      kf_boost = (kf_boost < 16) ? 16 : kf_boost;
-      target = ((16 + kf_boost) * rc->per_frame_bandwidth) >> 4;
-    }
-    rc->active_worst_quality = rc->worst_quality;
-  } else {
-    target = rc->per_frame_bandwidth;
-  }
-
   if (oxcf->rc_max_intra_bitrate_pct) {
-    const int max_rate = rc->per_frame_bandwidth *
-                             oxcf->rc_max_intra_bitrate_pct / 100;
+    const int max_rate = rc->av_per_frame_bandwidth *
+        oxcf->rc_max_intra_bitrate_pct / 100;
     target = MIN(target, max_rate);
   }
-  rc->this_frame_target = target;
+  if (target > rc->max_frame_bandwidth)
+    target = rc->max_frame_bandwidth;
+  return target;
+}
+
+
+// Update the buffer level for higher layers, given the encoded current layer.
+static void update_layer_buffer_level(VP9_COMP *const cpi,
+                                      int encoded_frame_size) {
+  int temporal_layer = 0;
+  int current_temporal_layer = cpi->svc.temporal_layer_id;
+  for (temporal_layer = current_temporal_layer + 1;
+      temporal_layer < cpi->svc.number_temporal_layers; ++temporal_layer) {
+    LAYER_CONTEXT *lc = &cpi->svc.layer_context[temporal_layer];
+    RATE_CONTROL *lrc = &lc->rc;
+    int bits_off_for_this_layer = (int)(lc->target_bandwidth / lc->framerate -
+        encoded_frame_size);
+    lrc->bits_off_target += bits_off_for_this_layer;
+
+    // Clip buffer level to maximum buffer size for the layer.
+    lrc->bits_off_target = MIN(lrc->bits_off_target, lc->maximum_buffer_size);
+    lrc->buffer_level = lrc->bits_off_target;
+  }
 }
 
 // Update the buffer level: leaky bucket model.
-void vp9_update_buffer_level(VP9_COMP *const cpi, int encoded_frame_size) {
+static void update_buffer_level(VP9_COMP *cpi, int encoded_frame_size) {
   const VP9_COMMON *const cm = &cpi->common;
   const VP9_CONFIG *oxcf = &cpi->oxcf;
   RATE_CONTROL *const rc = &cpi->rc;
 
   // Non-viewable frames are a special case and are treated as pure overhead.
   if (!cm->show_frame) {
     rc->bits_off_target -= encoded_frame_size;
   } else {
     rc->bits_off_target += rc->av_per_frame_bandwidth - encoded_frame_size;
   }
 
   // Clip the buffer level to the maximum specified buffer size.
-  rc->buffer_level = MIN(rc->bits_off_target, oxcf->maximum_buffer_size);
+  rc->bits_off_target = MIN(rc->bits_off_target, oxcf->maximum_buffer_size);
+  rc->buffer_level = rc->bits_off_target;
+
+  if (cpi->use_svc && cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) {
+    update_layer_buffer_level(cpi, encoded_frame_size);
+  }
 }
 
-int vp9_drop_frame(VP9_COMP *const cpi) {
+int vp9_rc_drop_frame(VP9_COMP *cpi) {
   const VP9_CONFIG *oxcf = &cpi->oxcf;
   RATE_CONTROL *const rc = &cpi->rc;
 
-
   if (!oxcf->drop_frames_water_mark) {
     return 0;
   } else {
     if (rc->buffer_level < 0) {
       // Always drop if buffer is below 0.
       return 1;
     } else {
       // If buffer is below drop_mark, for now just drop every other frame
       // (starting with the next frame) until it increases back over drop_mark.
       int drop_mark = (int)(oxcf->drop_frames_water_mark *
-                                oxcf->optimal_buffer_level / 100);
+          oxcf->optimal_buffer_level / 100);
       if ((rc->buffer_level > drop_mark) &&
           (rc->decimation_factor > 0)) {
         --rc->decimation_factor;
       } else if (rc->buffer_level <= drop_mark &&
           rc->decimation_factor == 0) {
         rc->decimation_factor = 1;
       }
       if (rc->decimation_factor > 0) {
         if (rc->decimation_count > 0) {
           --rc->decimation_count;
           return 1;
         } else {
           rc->decimation_count = rc->decimation_factor;
           return 0;
         }
       } else {
         rc->decimation_count = 0;
         return 0;
       }
     }
   }
 }
 
-// Adjust active_worst_quality level based on buffer level.
-static int adjust_active_worst_quality_from_buffer_level(const VP9_CONFIG *oxcf,
-    const RATE_CONTROL *rc) {
-  // Adjust active_worst_quality: If buffer is above the optimal/target level,
-  // bring active_worst_quality down depending on fullness over buffer.
-  // If buffer is below the optimal level, let the active_worst_quality go from
-  // ambient Q (at buffer = optimal level) to worst_quality level
-  // (at buffer = critical level).
-
-  int active_worst_quality = rc->active_worst_quality;
-  // Maximum limit for down adjustment, ~20%.
-  int max_adjustment_down = active_worst_quality / 5;
-  // Buffer level below which we push active_worst to worst_quality.
-  int critical_level = oxcf->optimal_buffer_level >> 2;
-  int adjustment = 0;
-  int buff_lvl_step = 0;
-  if (rc->buffer_level > oxcf->optimal_buffer_level) {
-    // Adjust down.
-    if (max_adjustment_down) {
-      buff_lvl_step = (int)((oxcf->maximum_buffer_size -
-          oxcf->optimal_buffer_level) / max_adjustment_down);
-      if (buff_lvl_step)
-        adjustment = (int)((rc->buffer_level - oxcf->optimal_buffer_level) /
-                            buff_lvl_step);
-      active_worst_quality -= adjustment;
-    }
-  } else if (rc->buffer_level > critical_level) {
-    // Adjust up from ambient Q.
-    if (critical_level) {
-      buff_lvl_step = (oxcf->optimal_buffer_level - critical_level);
-      if (buff_lvl_step) {
-        adjustment = (rc->worst_quality - rc->avg_frame_qindex[INTER_FRAME]) *
-                         (oxcf->optimal_buffer_level - rc->buffer_level) /
-                             buff_lvl_step;
-      }
-      active_worst_quality = rc->avg_frame_qindex[INTER_FRAME] + adjustment;
-    }
-  } else {
-    // Set to worst_quality if buffer is below critical level.
-    active_worst_quality = rc->worst_quality;
-  }
-  return active_worst_quality;
-}
-
-// Adjust target frame size with respect to the buffering constraints:
-static int target_size_from_buffer_level(const VP9_CONFIG *oxcf,
-                                         const RATE_CONTROL *rc) {
-  int target = rc->this_frame_target;
-  const int64_t diff = oxcf->optimal_buffer_level - rc->buffer_level;
-  const int one_pct_bits = 1 + oxcf->optimal_buffer_level / 100;
-
-  if (diff > 0) {
-    // Lower the target bandwidth for this frame.
-    const int pct_low = MIN(diff / one_pct_bits, oxcf->under_shoot_pct);
-    target -= (target * pct_low) / 200;
-  } else  if (diff < 0) {
-    // Increase the target bandwidth for this frame.
-    const int pct_high = MIN(-diff / one_pct_bits, oxcf->over_shoot_pct);
-    target += (target * pct_high) / 200;
-  }
-
-  return target;
-}
-
-static void calc_pframe_target_size(VP9_COMP *const cpi) {
-  RATE_CONTROL *const rc = &cpi->rc;
-  const VP9_CONFIG *const oxcf = &cpi->oxcf;
-  int min_frame_target = MAX(rc->min_frame_bandwidth,
-                             rc->av_per_frame_bandwidth >> 5);
-  if (cpi->refresh_alt_ref_frame) {
-    // Special alt reference frame case
-    // Per frame bit target for the alt ref frame
-    rc->per_frame_bandwidth = cpi->twopass.gf_bits;
-    rc->this_frame_target = rc->per_frame_bandwidth;
-  } else {
-    // Normal frames (gf and inter).
-    rc->this_frame_target = rc->per_frame_bandwidth;
-    // Set target frame size based on buffer level, for 1 pass CBR.
-    if (cpi->pass == 0 && oxcf->end_usage == USAGE_STREAM_FROM_SERVER) {
-      // Need to decide how low min_frame_target should be for 1-pass CBR.
-      // For now, use: cpi->rc.av_per_frame_bandwidth / 16:
-      min_frame_target = MAX(rc->av_per_frame_bandwidth >> 4,
-                             FRAME_OVERHEAD_BITS);
-      rc->this_frame_target = target_size_from_buffer_level(oxcf, rc);
-      // Adjust qp-max based on buffer level.
-      rc->active_worst_quality =
-          adjust_active_worst_quality_from_buffer_level(oxcf, rc);
-    }
-  }
-
-  // Check that the total sum of adjustments is not above the maximum allowed.
-  // That is, having allowed for the KF and GF penalties, we have not pushed
-  // the current inter-frame target too low. If the adjustment we apply here is
-  // not capable of recovering all the extra bits we have spent in the KF or GF,
-  // then the remainder will have to be recovered over a longer time span via
-  // other buffer / rate control mechanisms.
-  if (rc->this_frame_target < min_frame_target)
-    rc->this_frame_target = min_frame_target;
-
-  // Adjust target frame size for Golden Frames:
-  if (cpi->refresh_golden_frame) {
-    // If we are using alternate ref instead of gf then do not apply the boost
-    // It will instead be applied to the altref update
-    // Jims modified boost
-    if (!rc->source_alt_ref_active) {
-      // The spend on the GF is defined in the two pass code
-      // for two pass encodes
-      rc->this_frame_target = rc->per_frame_bandwidth;
-    } else {
-      // If there is an active ARF at this location use the minimum
-      // bits on this frame even if it is a constructed arf.
-      // The active maximum quantizer insures that an appropriate
-      // number of bits will be spent if needed for constructed ARFs.
-      rc->this_frame_target = 0;
-    }
-  }
-}
-
 static double get_rate_correction_factor(const VP9_COMP *cpi) {
   if (cpi->common.frame_type == KEY_FRAME) {
     return cpi->rc.key_frame_rate_correction_factor;
   } else {
-    if (cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame)
+    if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) &&
+        !(cpi->use_svc && cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER))
       return cpi->rc.gf_rate_correction_factor;
     else
       return cpi->rc.rate_correction_factor;
   }
 }
 
 static void set_rate_correction_factor(VP9_COMP *cpi, double factor) {
   if (cpi->common.frame_type == KEY_FRAME) {
     cpi->rc.key_frame_rate_correction_factor = factor;
   } else {
-    if (cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame)
+    if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) &&
+        !(cpi->use_svc && cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER))
       cpi->rc.gf_rate_correction_factor = factor;
     else
       cpi->rc.rate_correction_factor = factor;
   }
 }
 
 void vp9_rc_update_rate_correction_factors(VP9_COMP *cpi, int damp_var) {
   const int q = cpi->common.base_qindex;
   int correction_factor = 100;
   double rate_correction_factor = get_rate_correction_factor(cpi);
   double adjustment_limit;
 
   int projected_size_based_on_q = 0;
 
   // Clear down mmx registers to allow floating point in what follows
   vp9_clear_system_state();  // __asm emms;
 
   // Work out how big we would have expected the frame to be at this Q given
   // the current correction factor.
   // Stay in double to avoid int overflow when values are large
   projected_size_based_on_q = estimate_bits_at_q(cpi->common.frame_type, q,
                                                  cpi->common.MBs,
                                                  rate_correction_factor);
-
   // Work out a size correction factor.
   if (projected_size_based_on_q > 0)
     correction_factor = (100 * cpi->rc.projected_frame_size) /
                             projected_size_based_on_q;
 
   // More heavily damped adjustment used if we have been oscillating either side
   // of target.
   switch (damp_var) {
     case 0:
       adjustment_limit = 0.75;
@@ skipping 78 matching lines @@
     return high_motion_minq[q];
   } else {
     const int gap = high - low;
     const int offset = high - gfu_boost;
     const int qdiff = high_motion_minq[q] - low_motion_minq[q];
     const int adjustment = ((offset * qdiff) + (gap >> 1)) / gap;
     return low_motion_minq[q] + adjustment;
   }
 }
 
-int vp9_rc_pick_q_and_adjust_q_bounds(const VP9_COMP *cpi,
-                                      int *bottom_index, int *top_index) {
+static int calc_active_worst_quality_one_pass_vbr(const VP9_COMP *cpi) {
+  int active_worst_quality;
+  if (cpi->common.frame_type == KEY_FRAME) {
+    if (cpi->common.current_video_frame == 0) {
+      active_worst_quality = cpi->rc.worst_quality;
+    } else {
+      // Choose active worst quality twice as large as the last q.
+      active_worst_quality = cpi->rc.last_q[KEY_FRAME] * 2;
+    }
+  } else if (!cpi->rc.is_src_frame_alt_ref &&
+             (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
+    if (cpi->common.current_video_frame == 1) {
+      active_worst_quality = cpi->rc.last_q[KEY_FRAME] * 5 / 4;
+    } else {
+      // Choose active worst quality twice as large as the last q.
+      active_worst_quality = cpi->rc.last_q[INTER_FRAME];
+    }
+  } else {
+    if (cpi->common.current_video_frame == 1) {
+      active_worst_quality = cpi->rc.last_q[KEY_FRAME] * 2;
+    } else {
+      // Choose active worst quality twice as large as the last q.
+      active_worst_quality = cpi->rc.last_q[INTER_FRAME] * 2;
+    }
+  }
+  if (active_worst_quality > cpi->rc.worst_quality)
+    active_worst_quality = cpi->rc.worst_quality;
+  return active_worst_quality;
+}
+
+// Adjust active_worst_quality level based on buffer level.
+static int calc_active_worst_quality_one_pass_cbr(const VP9_COMP *cpi) {
+  // Adjust active_worst_quality: If buffer is above the optimal/target level,
+  // bring active_worst_quality down depending on fullness of buffer.
+  // If buffer is below the optimal level, let the active_worst_quality go from
+  // ambient Q (at buffer = optimal level) to worst_quality level
+  // (at buffer = critical level).
+  const VP9_CONFIG *oxcf = &cpi->oxcf;
+  const RATE_CONTROL *rc = &cpi->rc;
+  // Buffer level below which we push active_worst to worst_quality.
+  int critical_level = oxcf->optimal_buffer_level >> 2;
+  int adjustment = 0;
+  int buff_lvl_step = 0;
+  int active_worst_quality;
+  if (cpi->common.frame_type == KEY_FRAME)
+    return rc->worst_quality;
+  if (cpi->common.current_video_frame > 1)
+    active_worst_quality = MIN(rc->worst_quality,
+                               rc->avg_frame_qindex[INTER_FRAME] * 5 / 4);
+  else
+    active_worst_quality = MIN(rc->worst_quality,
+                               rc->avg_frame_qindex[KEY_FRAME] * 3 / 2);
+  if (rc->buffer_level > oxcf->optimal_buffer_level) {
+    // Adjust down.
+    // Maximum limit for down adjustment, ~30%.
+    int max_adjustment_down = active_worst_quality / 3;
+    if (max_adjustment_down) {
+      buff_lvl_step = (int)((oxcf->maximum_buffer_size -
+          oxcf->optimal_buffer_level) / max_adjustment_down);
+      if (buff_lvl_step)
+        adjustment = (int)((rc->buffer_level - oxcf->optimal_buffer_level) /
+                            buff_lvl_step);
+      active_worst_quality -= adjustment;
+    }
+  } else if (rc->buffer_level > critical_level) {
+    // Adjust up from ambient Q.
+    if (critical_level) {
+      buff_lvl_step = (oxcf->optimal_buffer_level - critical_level);
+      if (buff_lvl_step) {
+        adjustment = (rc->worst_quality - rc->avg_frame_qindex[INTER_FRAME]) *
+                         (oxcf->optimal_buffer_level - rc->buffer_level) /
+                             buff_lvl_step;
+      }
+      active_worst_quality = rc->avg_frame_qindex[INTER_FRAME] + adjustment;
+    }
+  } else {
+    // Set to worst_quality if buffer is below critical level.
+    active_worst_quality = rc->worst_quality;
+  }
+  return active_worst_quality;
+}
+
+static int rc_pick_q_and_bounds_one_pass_cbr(const VP9_COMP *cpi,
+                                             int *bottom_index,
+                                             int *top_index) {
+  const VP9_COMMON *const cm = &cpi->common;
+  const RATE_CONTROL *const rc = &cpi->rc;
+  int active_best_quality;
+  int active_worst_quality = calc_active_worst_quality_one_pass_cbr(cpi);
+  int q;
+
+  if (frame_is_intra_only(cm)) {
+    active_best_quality = rc->best_quality;
+    // Handle the special case for key frames forced when we have75 reached
+    // the maximum key frame interval. Here force the Q to a range
+    // based on the ambient Q to reduce the risk of popping.
+    if (rc->this_key_frame_forced) {
+      int qindex = rc->last_boosted_qindex;
+      double last_boosted_q = vp9_convert_qindex_to_q(qindex);
+      int delta_qindex = vp9_compute_qdelta(cpi, last_boosted_q,
+                                            (last_boosted_q * 0.75));
+      active_best_quality = MAX(qindex + delta_qindex, rc->best_quality);
+    } else if (cm->current_video_frame > 0) {
+      // not first frame of one pass and kf_boost is set
+      double q_adj_factor = 1.0;
+      double q_val;
+
+      active_best_quality = get_active_quality(rc->avg_frame_qindex[KEY_FRAME],
+                                               rc->kf_boost,
+                                               kf_low, kf_high,
+                                               kf_low_motion_minq,
+                                               kf_high_motion_minq);
+
+      // Allow somewhat lower kf minq with small image formats.
+      if ((cm->width * cm->height) <= (352 * 288)) {
+        q_adj_factor -= 0.25;
+      }
+
+      // Convert the adjustment factor to a qindex delta
+      // on active_best_quality.
+      q_val = vp9_convert_qindex_to_q(active_best_quality);
+      active_best_quality += vp9_compute_qdelta(cpi, q_val, q_val *
+                                                   q_adj_factor);
+    }
+  } else if (!rc->is_src_frame_alt_ref &&
+             (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
+    // Use the lower of active_worst_quality and recent
+    // average Q as basis for GF/ARF best Q limit unless last frame was
+    // a key frame.
+    if (rc->frames_since_key > 1 &&
+        rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
+      q = rc->avg_frame_qindex[INTER_FRAME];
+    } else {
+      q = active_worst_quality;
+    }
+    active_best_quality = get_active_quality(
+        q, rc->gfu_boost, gf_low, gf_high,
+        gf_low_motion_minq, gf_high_motion_minq);
+  } else {
+    // Use the lower of active_worst_quality and recent/average Q.
+    if (cm->current_video_frame > 1) {
+      if (rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality)
+        active_best_quality = inter_minq[rc->avg_frame_qindex[INTER_FRAME]];
+      else
+        active_best_quality = inter_minq[active_worst_quality];
+    } else {
+      if (rc->avg_frame_qindex[KEY_FRAME] < active_worst_quality)
+        active_best_quality = inter_minq[rc->avg_frame_qindex[KEY_FRAME]];
+      else
+        active_best_quality = inter_minq[active_worst_quality];
+    }
+  }
+
+  // Clip the active best and worst quality values to limits
+  active_best_quality = clamp(active_best_quality,
+                              rc->best_quality, rc->worst_quality);
+  active_worst_quality = clamp(active_worst_quality,
+                               active_best_quality, rc->worst_quality);
+
+  *top_index = active_worst_quality;
+  *bottom_index = active_best_quality;
+
+#if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
+  // Limit Q range for the adaptive loop.
+  if (cm->frame_type == KEY_FRAME && !rc->this_key_frame_forced) {
+    if (!(cm->current_video_frame == 0))
+      *top_index = (active_worst_quality + active_best_quality * 3) / 4;
+  }
+#endif
+  // Special case code to try and match quality with forced key frames
+  if (cm->frame_type == KEY_FRAME && rc->this_key_frame_forced) {
+    q = rc->last_boosted_qindex;
+  } else {
+    q = vp9_rc_regulate_q(cpi, rc->this_frame_target,
+                          active_best_quality, active_worst_quality);
+    if (q > *top_index) {
+      // Special case when we are targeting the max allowed rate
+      if (cpi->rc.this_frame_target >= cpi->rc.max_frame_bandwidth)
+        *top_index = q;
+      else
+        q = *top_index;
+    }
+  }
+  assert(*top_index <= rc->worst_quality &&
+         *top_index >= rc->best_quality);
+  assert(*bottom_index <= rc->worst_quality &&
+         *bottom_index >= rc->best_quality);
+  assert(q <= rc->worst_quality && q >= rc->best_quality);
+  return q;
+}
+
+static int rc_pick_q_and_bounds_one_pass_vbr(const VP9_COMP *cpi,
+                                             int *bottom_index,
+                                             int *top_index) {
   const VP9_COMMON *const cm = &cpi->common;
   const RATE_CONTROL *const rc = &cpi->rc;
   const VP9_CONFIG *const oxcf = &cpi->oxcf;
   int active_best_quality;
-  int active_worst_quality = rc->active_worst_quality;
+  int active_worst_quality = calc_active_worst_quality_one_pass_vbr(cpi);
   int q;
 
   if (frame_is_intra_only(cm)) {
     active_best_quality = rc->best_quality;
 #if !CONFIG_MULTIPLE_ARF
     // Handle the special case for key frames forced when we have75 reached
     // the maximum key frame interval. Here force the Q to a range
     // based on the ambient Q to reduce the risk of popping.
     if (rc->this_key_frame_forced) {
       int qindex = rc->last_boosted_qindex;
       double last_boosted_q = vp9_convert_qindex_to_q(qindex);
       int delta_qindex = vp9_compute_qdelta(cpi, last_boosted_q,
                                             (last_boosted_q * 0.75));
       active_best_quality = MAX(qindex + delta_qindex, rc->best_quality);
-    } else if (!(cpi->pass == 0 && cm->current_video_frame == 0)) {
+    } else if (cm->current_video_frame > 0) {
       // not first frame of one pass and kf_boost is set
       double q_adj_factor = 1.0;
       double q_val;
 
-      // Baseline value derived from cpi->active_worst_quality and kf boost
+      active_best_quality = get_active_quality(rc->avg_frame_qindex[KEY_FRAME],
+                                               rc->kf_boost,
+                                               kf_low, kf_high,
+                                               kf_low_motion_minq,
+                                               kf_high_motion_minq);
+
+      // Allow somewhat lower kf minq with small image formats.
+      if ((cm->width * cm->height) <= (352 * 288)) {
+        q_adj_factor -= 0.25;
+      }
+
+      // Convert the adjustment factor to a qindex delta
+      // on active_best_quality.
+      q_val = vp9_convert_qindex_to_q(active_best_quality);
+      active_best_quality += vp9_compute_qdelta(cpi, q_val, q_val *
+                                                   q_adj_factor);
+    }
+#else
+    double current_q;
+    // Force the KF quantizer to be 30% of the active_worst_quality.
+    current_q = vp9_convert_qindex_to_q(active_worst_quality);
+    active_best_quality = active_worst_quality
+        + vp9_compute_qdelta(cpi, current_q, current_q * 0.3);
+#endif
+  } else if (!rc->is_src_frame_alt_ref &&
+             (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
+    // Use the lower of active_worst_quality and recent
+    // average Q as basis for GF/ARF best Q limit unless last frame was
+    // a key frame.
+    if (rc->frames_since_key > 1 &&
+        rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
+      q = rc->avg_frame_qindex[INTER_FRAME];
+    } else {
+      q = rc->avg_frame_qindex[KEY_FRAME];
+    }
+    // For constrained quality dont allow Q less than the cq level
+    if (oxcf->end_usage == USAGE_CONSTRAINED_QUALITY) {
+      if (q < cpi->cq_target_quality)
+        q = cpi->cq_target_quality;
+      if (rc->frames_since_key > 1) {
+        active_best_quality = get_active_quality(q, rc->gfu_boost,
+                                                 gf_low, gf_high,
+                                                 afq_low_motion_minq,
+                                                 afq_high_motion_minq);
+      } else {
+        active_best_quality = get_active_quality(q, rc->gfu_boost,
+                                                 gf_low, gf_high,
+                                                 gf_low_motion_minq,
+                                                 gf_high_motion_minq);
+      }
+      // Constrained quality use slightly lower active best.
+      active_best_quality = active_best_quality * 15 / 16;
+
+    } else if (oxcf->end_usage == USAGE_CONSTANT_QUALITY) {
+      if (!cpi->refresh_alt_ref_frame) {
+        active_best_quality = cpi->cq_target_quality;
+      } else {
+        if (rc->frames_since_key > 1) {
+          active_best_quality = get_active_quality(
+              q, rc->gfu_boost, gf_low, gf_high,
+              afq_low_motion_minq, afq_high_motion_minq);
+        } else {
+          active_best_quality = get_active_quality(
+              q, rc->gfu_boost, gf_low, gf_high,
+              gf_low_motion_minq, gf_high_motion_minq);
+        }
+      }
+    } else {
+      active_best_quality = get_active_quality(
+          q, rc->gfu_boost, gf_low, gf_high,
+          gf_low_motion_minq, gf_high_motion_minq);
+    }
+  } else {
+    if (oxcf->end_usage == USAGE_CONSTANT_QUALITY) {
+      active_best_quality = cpi->cq_target_quality;
+    } else {
+      // Use the lower of active_worst_quality and recent/average Q.
+      if (cm->current_video_frame > 1)
+        active_best_quality = inter_minq[rc->avg_frame_qindex[INTER_FRAME]];
+      else
+        active_best_quality = inter_minq[rc->avg_frame_qindex[KEY_FRAME]];
+      // For the constrained quality mode we don't want
+      // q to fall below the cq level.
+      if ((oxcf->end_usage == USAGE_CONSTRAINED_QUALITY) &&
+          (active_best_quality < cpi->cq_target_quality)) {
+        // If we are strongly undershooting the target rate in the last
+        // frames then use the user passed in cq value not the auto
+        // cq value.
+        if (rc->rolling_actual_bits < rc->min_frame_bandwidth)
+          active_best_quality = oxcf->cq_level;
+        else
+          active_best_quality = cpi->cq_target_quality;
+      }
+    }
+  }
+
+  // Clip the active best and worst quality values to limits
+  active_best_quality = clamp(active_best_quality,
+                              rc->best_quality, rc->worst_quality);
+  active_worst_quality = clamp(active_worst_quality,
+                               active_best_quality, rc->worst_quality);
+
+  *top_index = active_worst_quality;
+  *bottom_index = active_best_quality;
+
+#if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
+  // Limit Q range for the adaptive loop.
+  if (cm->frame_type == KEY_FRAME && !rc->this_key_frame_forced) {
+    if (!(cm->current_video_frame == 0))
+      *top_index = (active_worst_quality + active_best_quality * 3) / 4;
+  } else if (!rc->is_src_frame_alt_ref &&
+             (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
+    *top_index = (active_worst_quality + active_best_quality) / 2;
+  }
+#endif
+  if (oxcf->end_usage == USAGE_CONSTANT_QUALITY) {
+    q = active_best_quality;
+  // Special case code to try and match quality with forced key frames
+  } else if ((cm->frame_type == KEY_FRAME) && rc->this_key_frame_forced) {
+    q = rc->last_boosted_qindex;
+  } else {
+    q = vp9_rc_regulate_q(cpi, rc->this_frame_target,
+                          active_best_quality, active_worst_quality);
+    if (q > *top_index) {
+      // Special case when we are targeting the max allowed rate
+      if (cpi->rc.this_frame_target >= cpi->rc.max_frame_bandwidth)
+        *top_index = q;
+      else
+        q = *top_index;
+    }
+  }
+#if CONFIG_MULTIPLE_ARF
+  // Force the quantizer determined by the coding order pattern.
+  if (cpi->multi_arf_enabled && (cm->frame_type != KEY_FRAME) &&
+      cpi->oxcf.end_usage != USAGE_CONSTANT_QUALITY) {
+    double new_q;
+    double current_q = vp9_convert_qindex_to_q(active_worst_quality);
+    int level = cpi->this_frame_weight;
+    assert(level >= 0);
+    new_q = current_q * (1.0 - (0.2 * (cpi->max_arf_level - level)));
+    q = active_worst_quality +
+        vp9_compute_qdelta(cpi, current_q, new_q);
+
+    *bottom_index = q;
+    *top_index    = q;
+    printf("frame:%d q:%d\n", cm->current_video_frame, q);
+  }
+#endif
+  assert(*top_index <= rc->worst_quality &&
+         *top_index >= rc->best_quality);
+  assert(*bottom_index <= rc->worst_quality &&
+         *bottom_index >= rc->best_quality);
+  assert(q <= rc->worst_quality && q >= rc->best_quality);
+  return q;
+}
+
+static int rc_pick_q_and_bounds_two_pass(const VP9_COMP *cpi,
+                                         int *bottom_index,
+                                         int *top_index) {
+  const VP9_COMMON *const cm = &cpi->common;
+  const RATE_CONTROL *const rc = &cpi->rc;
+  const VP9_CONFIG *const oxcf = &cpi->oxcf;
+  int active_best_quality;
+  int active_worst_quality = cpi->twopass.active_worst_quality;
+  int q;
+
+  if (frame_is_intra_only(cm)) {
+#if !CONFIG_MULTIPLE_ARF
+    // Handle the special case for key frames forced when we have75 reached
+    // the maximum key frame interval. Here force the Q to a range
+    // based on the ambient Q to reduce the risk of popping.
+    if (rc->this_key_frame_forced) {
+      int qindex = rc->last_boosted_qindex;
+      double last_boosted_q = vp9_convert_qindex_to_q(qindex);
+      int delta_qindex = vp9_compute_qdelta(cpi, last_boosted_q,
+                                            (last_boosted_q * 0.75));
+      active_best_quality = MAX(qindex + delta_qindex, rc->best_quality);
+    } else {
+      // Not forced keyframe.
+      double q_adj_factor = 1.0;
+      double q_val;
+      // Baseline value derived from cpi->active_worst_quality and kf boost.
       active_best_quality = get_active_quality(active_worst_quality,
                                                rc->kf_boost,
                                                kf_low, kf_high,
                                                kf_low_motion_minq,
                                                kf_high_motion_minq);
 
       // Allow somewhat lower kf minq with small image formats.
       if ((cm->width * cm->height) <= (352 * 288)) {
         q_adj_factor -= 0.25;
       }
 
       // Make a further adjustment based on the kf zero motion measure.
       q_adj_factor += 0.05 - (0.001 * (double)cpi->twopass.kf_zeromotion_pct);
 
       // Convert the adjustment factor to a qindex delta
       // on active_best_quality.
       q_val = vp9_convert_qindex_to_q(active_best_quality);
       active_best_quality += vp9_compute_qdelta(cpi, q_val, q_val *
                                                    q_adj_factor);
     }
 #else
     double current_q;
     // Force the KF quantizer to be 30% of the active_worst_quality.
     current_q = vp9_convert_qindex_to_q(active_worst_quality);
     active_best_quality = active_worst_quality
         + vp9_compute_qdelta(cpi, current_q, current_q * 0.3);
 #endif
   } else if (!rc->is_src_frame_alt_ref &&
              (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
-
     // Use the lower of active_worst_quality and recent
     // average Q as basis for GF/ARF best Q limit unless last frame was
     // a key frame.
     if (rc->frames_since_key > 1 &&
         rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
       q = rc->avg_frame_qindex[INTER_FRAME];
     } else {
       q = active_worst_quality;
     }
     // For constrained quality dont allow Q less than the cq level
@@ skipping 30 matching lines @@
       }
     } else {
       active_best_quality = get_active_quality(
           q, rc->gfu_boost, gf_low, gf_high,
           gf_low_motion_minq, gf_high_motion_minq);
     }
   } else {
     if (oxcf->end_usage == USAGE_CONSTANT_QUALITY) {
       active_best_quality = cpi->cq_target_quality;
     } else {
-      if (cpi->pass == 0 &&
-          rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality)
-        // 1-pass: for now, use the average Q for the active_best, if its lower
-        // than active_worst.
-        active_best_quality = inter_minq[rc->avg_frame_qindex[INTER_FRAME]];
-      else
-        active_best_quality = inter_minq[active_worst_quality];
+      active_best_quality = inter_minq[active_worst_quality];
 
       // For the constrained quality mode we don't want
       // q to fall below the cq level.
       if ((oxcf->end_usage == USAGE_CONSTRAINED_QUALITY) &&
           (active_best_quality < cpi->cq_target_quality)) {
         // If we are strongly undershooting the target rate in the last
         // frames then use the user passed in cq value not the auto
         // cq value.
         if (rc->rolling_actual_bits < rc->min_frame_bandwidth)
           active_best_quality = oxcf->cq_level;
         else
           active_best_quality = cpi->cq_target_quality;
       }
     }
   }
 
-  // Clip the active best and worst quality values to limits
+  // Clip the active best and worst quality values to limits.
   if (active_worst_quality > rc->worst_quality)
     active_worst_quality = rc->worst_quality;
 
   if (active_best_quality < rc->best_quality)
     active_best_quality = rc->best_quality;
 
   if (active_best_quality > rc->worst_quality)
     active_best_quality = rc->worst_quality;
 
   if (active_worst_quality < active_best_quality)
     active_worst_quality = active_best_quality;
 
   *top_index = active_worst_quality;
   *bottom_index = active_best_quality;
 
 #if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
   // Limit Q range for the adaptive loop.
   if (cm->frame_type == KEY_FRAME && !rc->this_key_frame_forced) {
-    if (!(cpi->pass == 0 && cm->current_video_frame == 0))
-      *top_index = (active_worst_quality + active_best_quality * 3) / 4;
+    *top_index = (active_worst_quality + active_best_quality * 3) / 4;
   } else if (!rc->is_src_frame_alt_ref &&
              (oxcf->end_usage != USAGE_STREAM_FROM_SERVER) &&
              (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
     *top_index = (active_worst_quality + active_best_quality) / 2;
   }
 #endif
 
   if (oxcf->end_usage == USAGE_CONSTANT_QUALITY) {
     q = active_best_quality;
-  // Special case code to try and match quality with forced key frames
+  // Special case code to try and match quality with forced key frames.
   } else if ((cm->frame_type == KEY_FRAME) && rc->this_key_frame_forced) {
     q = rc->last_boosted_qindex;
   } else {
     q = vp9_rc_regulate_q(cpi, rc->this_frame_target,
                           active_best_quality, active_worst_quality);
     if (q > *top_index) {
-      // Special case when we are targeting the max allowed rate
+      // Special case when we are targeting the max allowed rate.
       if (cpi->rc.this_frame_target >= cpi->rc.max_frame_bandwidth)
         *top_index = q;
       else
         q = *top_index;
     }
   }
 #if CONFIG_MULTIPLE_ARF
   // Force the quantizer determined by the coding order pattern.
   if (cpi->multi_arf_enabled && (cm->frame_type != KEY_FRAME) &&
       cpi->oxcf.end_usage != USAGE_CONSTANT_QUALITY) {
@@ skipping 11 matching lines @@
   }
 #endif
   assert(*top_index <= rc->worst_quality &&
          *top_index >= rc->best_quality);
   assert(*bottom_index <= rc->worst_quality &&
          *bottom_index >= rc->best_quality);
   assert(q <= rc->worst_quality && q >= rc->best_quality);
   return q;
 }
 
+int vp9_rc_pick_q_and_bounds(const VP9_COMP *cpi,
+                             int *bottom_index,
+                             int *top_index) {
+  int q;
+  if (cpi->pass == 0) {
+    if (cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER)
+      q = rc_pick_q_and_bounds_one_pass_cbr(cpi, bottom_index, top_index);
+    else
+      q = rc_pick_q_and_bounds_one_pass_vbr(cpi, bottom_index, top_index);
+  } else {
+    q = rc_pick_q_and_bounds_two_pass(cpi, bottom_index, top_index);
+  }
+
+  // JBB : This is realtime mode.  In real time mode the first frame
+  // should be larger. Q of 0 is disabled because we force tx size to be
+  // 16x16...
+  if (cpi->sf.use_pick_mode) {
+    if (cpi->common.current_video_frame == 0)
+      q /= 3;
+    if (q == 0)
+      q++;
+    if (q < *bottom_index)
+      *bottom_index = q;
+    else if (q > *top_index)
+      *top_index = q;
+  }
+  return q;
+}
+
 void vp9_rc_compute_frame_size_bounds(const VP9_COMP *cpi,
                                       int this_frame_target,
                                       int *frame_under_shoot_limit,
                                       int *frame_over_shoot_limit) {
   // Set-up bounds on acceptable frame size:
   if (cpi->oxcf.end_usage == USAGE_CONSTANT_QUALITY) {
     *frame_under_shoot_limit = 0;
     *frame_over_shoot_limit  = INT_MAX;
   } else {
     if (cpi->common.frame_type == KEY_FRAME) {
@@ skipping 23 matching lines @@
     if (*frame_under_shoot_limit < 0)
       *frame_under_shoot_limit = 0;
 
     // Clip to maximum allowed rate for a frame.
     if (*frame_over_shoot_limit > cpi->rc.max_frame_bandwidth) {
       *frame_over_shoot_limit = cpi->rc.max_frame_bandwidth;
     }
   }
 }
 
-// return of 0 means drop frame
-int vp9_rc_pick_frame_size_target(VP9_COMP *cpi) {
+void vp9_rc_set_frame_target(VP9_COMP *cpi, int target) {
   const VP9_COMMON *const cm = &cpi->common;
   RATE_CONTROL *const rc = &cpi->rc;
 
-  if (cm->frame_type == KEY_FRAME)
-    calc_iframe_target_size(cpi);
-  else
-    calc_pframe_target_size(cpi);
-
-  // Clip the frame target to the maximum allowed value.
-  if (rc->this_frame_target > rc->max_frame_bandwidth)
-    rc->this_frame_target = rc->max_frame_bandwidth;
-
+  rc->this_frame_target = target;
   // Target rate per SB64 (including partial SB64s.
   rc->sb64_target_rate = ((int64_t)rc->this_frame_target * 64 * 64) /
                              (cm->width * cm->height);
-  return 1;
 }
 
 static void update_alt_ref_frame_stats(VP9_COMP *cpi) {
   // this frame refreshes means next frames don't unless specified by user
   cpi->rc.frames_since_golden = 0;
 
 #if CONFIG_MULTIPLE_ARF
   if (!cpi->multi_arf_enabled)
 #endif
     // Clear the alternate reference update pending flag.
@@ skipping 23 matching lines @@
     if (rc->frames_till_gf_update_due > 0)
       rc->frames_till_gf_update_due--;
 
     rc->frames_since_golden++;
   }
 }
 
 void vp9_rc_postencode_update(VP9_COMP *cpi, uint64_t bytes_used) {
   VP9_COMMON *const cm = &cpi->common;
   RATE_CONTROL *const rc = &cpi->rc;
+
+  cm->last_frame_type = cm->frame_type;
   // Update rate control heuristics
   rc->projected_frame_size = (bytes_used << 3);
 
   // Post encode loop adjustment of Q prediction.
-  vp9_rc_update_rate_correction_factors(cpi, (cpi->sf.recode_loop ||
+  vp9_rc_update_rate_correction_factors(
+      cpi, (cpi->sf.recode_loop >= ALLOW_RECODE_KFARFGF ||
             cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) ? 2 : 0);
 
   // Keep a record of last Q and ambient average Q.
   if (cm->frame_type == KEY_FRAME) {
     rc->last_q[KEY_FRAME] = cm->base_qindex;
     rc->avg_frame_qindex[KEY_FRAME] = ROUND_POWER_OF_TWO(
         3 * rc->avg_frame_qindex[KEY_FRAME] + cm->base_qindex, 2);
   } else if (!rc->is_src_frame_alt_ref &&
-             (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
+      (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame) &&
+      !(cpi->use_svc && cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER)) {
     rc->last_q[2] = cm->base_qindex;
     rc->avg_frame_qindex[2] = ROUND_POWER_OF_TWO(
         3 * rc->avg_frame_qindex[2] + cm->base_qindex, 2);
   } else {
     rc->last_q[INTER_FRAME] = cm->base_qindex;
     rc->avg_frame_qindex[INTER_FRAME] = ROUND_POWER_OF_TWO(
         3 * rc->avg_frame_qindex[INTER_FRAME] + cm->base_qindex, 2);
     rc->ni_frames++;
     rc->tot_q += vp9_convert_qindex_to_q(cm->base_qindex);
     rc->avg_q = rc->tot_q / (double)rc->ni_frames;
 
     // Calculate the average Q for normal inter frames (not key or GFU frames).
     rc->ni_tot_qi += cm->base_qindex;
     rc->ni_av_qi = rc->ni_tot_qi / rc->ni_frames;
   }
 
   // Keep record of last boosted (KF/KF/ARF) Q value.
   // If the current frame is coded at a lower Q then we also update it.
   // If all mbs in this group are skipped only update if the Q value is
   // better than that already stored.
   // This is used to help set quality in forced key frames to reduce popping
   if ((cm->base_qindex < rc->last_boosted_qindex) ||
       ((cpi->static_mb_pct < 100) &&
        ((cm->frame_type == KEY_FRAME) || cpi->refresh_alt_ref_frame ||
         (cpi->refresh_golden_frame && !rc->is_src_frame_alt_ref)))) {
     rc->last_boosted_qindex = cm->base_qindex;
   }
 
-  vp9_update_buffer_level(cpi, rc->projected_frame_size);
+  update_buffer_level(cpi, rc->projected_frame_size);
 
   // Rolling monitors of whether we are over or underspending used to help
   // regulate min and Max Q in two pass.
   if (cm->frame_type != KEY_FRAME) {
     rc->rolling_target_bits = ROUND_POWER_OF_TWO(
         rc->rolling_target_bits * 3 + rc->this_frame_target, 2);
     rc->rolling_actual_bits = ROUND_POWER_OF_TWO(
         rc->rolling_actual_bits * 3 + rc->projected_frame_size, 2);
     rc->long_rolling_target_bits = ROUND_POWER_OF_TWO(
         rc->long_rolling_target_bits * 31 + rc->this_frame_target, 5);
     rc->long_rolling_actual_bits = ROUND_POWER_OF_TWO(
         rc->long_rolling_actual_bits * 31 + rc->projected_frame_size, 5);
   }
 
   // Actual bits spent
   rc->total_actual_bits += rc->projected_frame_size;
 
   // Debug stats
   rc->total_target_vs_actual += (rc->this_frame_target -
                                  rc->projected_frame_size);
 
-#ifndef DISABLE_RC_LONG_TERM_MEM
-  // Update bits left to the kf and gf groups to account for overshoot or
-  // undershoot on these frames
-  if (cm->frame_type == KEY_FRAME) {
-    cpi->twopass.kf_group_bits += cpi->rc.this_frame_target -
-                                  cpi->rc.projected_frame_size;
-
-    cpi->twopass.kf_group_bits = MAX(cpi->twopass.kf_group_bits, 0);
-  } else if (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame) {
-    cpi->twopass.gf_group_bits += cpi->rc.this_frame_target -
-                                  cpi->rc.projected_frame_size;
-
-    cpi->twopass.gf_group_bits = MAX(cpi->twopass.gf_group_bits, 0);
-  }
-#endif
-
   if (cpi->oxcf.play_alternate && cpi->refresh_alt_ref_frame &&
       (cm->frame_type != KEY_FRAME))
     // Update the alternate reference frame stats as appropriate.
     update_alt_ref_frame_stats(cpi);
   else
     // Update the Golden frame stats as appropriate.
     update_golden_frame_stats(cpi);
 
   if (cm->frame_type == KEY_FRAME)
     rc->frames_since_key = 0;
   if (cm->show_frame) {
     rc->frames_since_key++;
     rc->frames_to_key--;
   }
 }
 
 void vp9_rc_postencode_update_drop_frame(VP9_COMP *cpi) {
+  // Update buffer level with zero size, update frame counters, and return.
+  update_buffer_level(cpi, 0);
+  cpi->common.last_frame_type = cpi->common.frame_type;
   cpi->rc.frames_since_key++;
   cpi->rc.frames_to_key--;
 }
+
+static int test_for_kf_one_pass(VP9_COMP *cpi) {
+  // Placeholder function for auto key frame
+  return 0;
+}
+// Use this macro to turn on/off use of alt-refs in one-pass mode.
+#define USE_ALTREF_FOR_ONE_PASS   1
+
+static int calc_pframe_target_size_one_pass_vbr(const VP9_COMP *const cpi) {
+  static const int af_ratio = 10;
+  const RATE_CONTROL *rc = &cpi->rc;
+  int target;
+#if USE_ALTREF_FOR_ONE_PASS
+  target = (!rc->is_src_frame_alt_ref &&
+            (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) ?
+      (rc->av_per_frame_bandwidth * cpi->rc.baseline_gf_interval * af_ratio) /
+      (cpi->rc.baseline_gf_interval + af_ratio - 1) :
+      (rc->av_per_frame_bandwidth * cpi->rc.baseline_gf_interval) /
+      (cpi->rc.baseline_gf_interval + af_ratio - 1);
+#else
+  target = rc->av_per_frame_bandwidth;
+#endif
+  return vp9_rc_clamp_pframe_target_size(cpi, target);
+}
+
+static int calc_iframe_target_size_one_pass_vbr(const VP9_COMP *const cpi) {
+  static const int kf_ratio = 25;
+  const RATE_CONTROL *rc = &cpi->rc;
+  int target = rc->av_per_frame_bandwidth * kf_ratio;
+  return vp9_rc_clamp_iframe_target_size(cpi, target);
+}
+
+void vp9_rc_get_one_pass_vbr_params(VP9_COMP *cpi) {
+  VP9_COMMON *const cm = &cpi->common;
+  RATE_CONTROL *const rc = &cpi->rc;
+  int target;
+  if (!cpi->refresh_alt_ref_frame &&
+      (cm->current_video_frame == 0 ||
+       cm->frame_flags & FRAMEFLAGS_KEY ||
+       rc->frames_to_key == 0 ||
+       (cpi->oxcf.auto_key && test_for_kf_one_pass(cpi)))) {
+    cm->frame_type = KEY_FRAME;
+    rc->this_key_frame_forced = cm->current_video_frame != 0 &&
+                                rc->frames_to_key == 0;
+    rc->frames_to_key = cpi->key_frame_frequency;
+    rc->kf_boost = DEFAULT_KF_BOOST;
+    rc->source_alt_ref_active = 0;
+  } else {
+    cm->frame_type = INTER_FRAME;
+  }
+  if (rc->frames_till_gf_update_due == 0) {
+    rc->baseline_gf_interval = DEFAULT_GF_INTERVAL;
+    rc->frames_till_gf_update_due = rc->baseline_gf_interval;
+    // NOTE: frames_till_gf_update_due must be <= frames_to_key.
+    if (rc->frames_till_gf_update_due > rc->frames_to_key)
+      rc->frames_till_gf_update_due = rc->frames_to_key;
+    cpi->refresh_golden_frame = 1;
+    rc->source_alt_ref_pending = USE_ALTREF_FOR_ONE_PASS;
+    rc->gfu_boost = DEFAULT_GF_BOOST;
+  }
+  if (cm->frame_type == KEY_FRAME)
+    target = calc_iframe_target_size_one_pass_vbr(cpi);
+  else
+    target = calc_pframe_target_size_one_pass_vbr(cpi);
+  vp9_rc_set_frame_target(cpi, target);
+}
+
+static int calc_pframe_target_size_one_pass_cbr(const VP9_COMP *cpi) {
+  const VP9_CONFIG *oxcf = &cpi->oxcf;
+  const RATE_CONTROL *rc = &cpi->rc;
+  const int64_t diff = oxcf->optimal_buffer_level - rc->buffer_level;
+  const int one_pct_bits = 1 + oxcf->optimal_buffer_level / 100;
+  int min_frame_target = MAX(rc->av_per_frame_bandwidth >> 4,
+                             FRAME_OVERHEAD_BITS);
+  int target = rc->av_per_frame_bandwidth;
+  if (cpi->svc.number_temporal_layers > 1 &&
+      cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) {
+    // Note that for layers, av_per_frame_bandwidth is the cumulative
+    // per-frame-bandwidth. For the target size of this frame, use the
+    // layer average frame size (i.e., non-cumulative per-frame-bw).
+    int current_temporal_layer = cpi->svc.temporal_layer_id;
+    const LAYER_CONTEXT *lc = &cpi->svc.layer_context[current_temporal_layer];
+    target = lc->avg_frame_size;
+    min_frame_target = MAX(lc->avg_frame_size >> 4, FRAME_OVERHEAD_BITS);
+  }
+  if (diff > 0) {
+    // Lower the target bandwidth for this frame.
+    const int pct_low = MIN(diff / one_pct_bits, oxcf->under_shoot_pct);
+    target -= (target * pct_low) / 200;
+  } else if (diff < 0) {
+    // Increase the target bandwidth for this frame.
+    const int pct_high = MIN(-diff / one_pct_bits, oxcf->over_shoot_pct);
+    target += (target * pct_high) / 200;
+  }
+  return MAX(min_frame_target, target);
+}
+
+static int calc_iframe_target_size_one_pass_cbr(const VP9_COMP *cpi) {
+  const RATE_CONTROL *rc = &cpi->rc;
+
+  if (cpi->common.current_video_frame == 0) {
+    return cpi->oxcf.starting_buffer_level / 2;
+  } else {
+    const int initial_boost = 32;
+    int kf_boost = MAX(initial_boost, (int)(2 * cpi->output_framerate - 16));
+    if (rc->frames_since_key < cpi->output_framerate / 2) {
+      kf_boost = (int)(kf_boost * rc->frames_since_key /
+                       (cpi->output_framerate / 2));
+    }
+    return ((16 + kf_boost) * rc->av_per_frame_bandwidth) >> 4;
+  }
+}
+
+void vp9_rc_get_svc_params(VP9_COMP *cpi) {
+  VP9_COMMON *const cm = &cpi->common;
+  int target = cpi->rc.av_per_frame_bandwidth;
+  if ((cm->current_video_frame == 0) ||
+      (cm->frame_flags & FRAMEFLAGS_KEY) ||
+      (cpi->oxcf.auto_key && (cpi->rc.frames_since_key %
+                              cpi->key_frame_frequency == 0))) {
+    cm->frame_type = KEY_FRAME;
+    cpi->rc.source_alt_ref_active = 0;
+    if (cpi->pass == 0 && cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) {
+      target = calc_iframe_target_size_one_pass_cbr(cpi);
+    }
+  } else {
+    cm->frame_type = INTER_FRAME;
+    if (cpi->pass == 0 && cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) {
+      target = calc_pframe_target_size_one_pass_cbr(cpi);
+    }
+  }
+  vp9_rc_set_frame_target(cpi, target);
+  cpi->rc.frames_till_gf_update_due = INT_MAX;
+  cpi->rc.baseline_gf_interval = INT_MAX;
+}
+
+void vp9_rc_get_one_pass_cbr_params(VP9_COMP *cpi) {
+  VP9_COMMON *const cm = &cpi->common;
+  RATE_CONTROL *const rc = &cpi->rc;
+  int target;
+  if ((cm->current_video_frame == 0 ||
+      cm->frame_flags & FRAMEFLAGS_KEY ||
+      rc->frames_to_key == 0 ||
+      (cpi->oxcf.auto_key && test_for_kf_one_pass(cpi)))) {
+    cm->frame_type = KEY_FRAME;
+    rc->this_key_frame_forced = cm->current_video_frame != 0 &&
+                                rc->frames_to_key == 0;
+    rc->frames_to_key = cpi->key_frame_frequency;
+    rc->kf_boost = DEFAULT_KF_BOOST;
+    rc->source_alt_ref_active = 0;
+    target = calc_iframe_target_size_one_pass_cbr(cpi);
+  } else {
+    cm->frame_type = INTER_FRAME;
+    target = calc_pframe_target_size_one_pass_cbr(cpi);
+  }
+  vp9_rc_set_frame_target(cpi, target);
+  // Don't use gf_update by default in CBR mode.
+  rc->frames_till_gf_update_due = INT_MAX;
+  rc->baseline_gf_interval = INT_MAX;
+}