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vp8 rc: always update correction factor

Change-Id: Id40b9cb5a85a15fb313a2a93f14f6768259f7c15

--- a/vp8/encoder/onyx_if.c

+++ b/vp8/encoder/onyx_if.c

@@ -1910,6 +1910,7 @@

   cpi->force_maxqp = 0;

   cpi->frames_since_last_drop_overshoot = 0;

+  cpi->rt_always_update_correction_factor = 0;

   cpi->b_calculate_psnr = CONFIG_INTERNAL_STATS;

 #if CONFIG_INTERNAL_STATS

@@ -4445,7 +4446,8 @@

     }

   }

-  if (!active_worst_qchanged) vp8_update_rate_correction_factors(cpi, 2);

+  if (cpi->rt_always_update_correction_factor || !active_worst_qchanged)

+    vp8_update_rate_correction_factors(cpi, 2);

   cpi->last_q[cm->frame_type] = cm->base_qindex;

--- a/vp8/encoder/onyx_int.h

+++ b/vp8/encoder/onyx_int.h

@@ -702,6 +702,10 @@

   int use_roi_static_threshold;

   int ext_refresh_frame_flags_pending;

+

+  // Always update correction factor used for rate control after each frame for

+  // realtime encoding.

+  int rt_always_update_correction_factor;

 } VP8_COMP;

 void vp8_initialize_enc(void);

--- a/vp8/vp8_cx_iface.c

+++ b/vp8/vp8_cx_iface.c

@@ -611,6 +611,7 @@

   const unsigned int data = CAST(VP8E_SET_GF_CBR_BOOST_PCT, args);

   if (data) {

     cpi->cyclic_refresh_mode_enabled = 0;

+    cpi->rt_always_update_correction_factor = 1;

   }

   return VPX_CODEC_OK;

 }