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Modified no memory rate control.

This 2-pass rate control setting allocates bits based
on first pass stats to each kf group, gf group and individual
frame but does not correct the bits left and allocation after
each frame.

In other words it recommends a bit allocation for each frame
but does not try and correct any over or under spend on a
frame over the remainder of the clip. This reduces the accuracy
of rate control in terms of hitting an average bitrate but prevents
problems that may arise because early frames either use to many
or too few bits. This mode is currently more inclined to undershoot
than overshoot (particularly at higher data rates).

Also minor changes to rate of adaption when recode loop is not
enabled.

This mode is currently enabled by default for VBR.
It gives the following % performance gains.

derf +0.467, +1.072
yt 2.962, 2.645
stdhd 1.682, 1.595,
yt-hd 2.3, 2.174

Change-Id: I3c84a9bf8884e5b345698ff0e19187f792c2f3a0

--- a/vp9/encoder/vp9_onyx_if.c

+++ b/vp9/encoder/vp9_onyx_if.c

@@ -1743,7 +1743,7 @@

   vp9_zero(cpi->y_uv_mode_count);

 #ifdef MODE_TEST_HIT_STATS

-  vp9_zero(cpi->mode_test_hits)

+  vp9_zero(cpi->mode_test_hits);

 #endif

   return (VP9_PTR) cpi;

@@ -3295,8 +3295,9 @@

   cpi->total_byte_count += (*size);

   cpi->projected_frame_size = (*size) << 3;

+  // Post encode loop adjustment of Q prediction.

   if (!active_worst_qchanged)

-    vp9_update_rate_correction_factors(cpi, 2);

+    vp9_update_rate_correction_factors(cpi, (cpi->sf.recode_loop) ? 2 : 0);

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

@@ -3371,6 +3372,7 @@

   cpi->buffer_level = cpi->bits_off_target;

+#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) {

@@ -3384,6 +3386,7 @@

     cpi->twopass.gf_group_bits = MAX(cpi->twopass.gf_group_bits, 0);

   }

+#endif

 #if 0

   output_frame_level_debug_stats(cpi);

--- a/vp9/encoder/vp9_onyx_int.h

+++ b/vp9/encoder/vp9_onyx_int.h

@@ -33,8 +33,8 @@

 #if CONFIG_ONESHOTQ

 #define ONE_SHOT_Q_ESTIMATE 0

 #define STRICT_ONE_SHOT_Q 0

-#define DISABLE_RC_LONG_TERM_MEM 0

 #endif

+#define DISABLE_RC_LONG_TERM_MEM 0

 // #define MODE_TEST_HIT_STATS

--- a/vp9/encoder/vp9_ratectrl.c

+++ b/vp9/encoder/vp9_ratectrl.c

@@ -288,7 +288,7 @@

   if (correction_factor > 102) {

     // We are not already at the worst allowable quality

     correction_factor =

-        (int)(100.5 + ((correction_factor - 100) * adjustment_limit));

+        (int)(100 + ((correction_factor - 100) * adjustment_limit));

     rate_correction_factor =

         ((rate_correction_factor * correction_factor) / 100);

@@ -298,7 +298,7 @@

   } else if (correction_factor < 99) {

     // We are not already at the best allowable quality

     correction_factor =

-        (int)(100.5 - ((100 - correction_factor) * adjustment_limit));

+        (int)(100 - ((100 - correction_factor) * adjustment_limit));

     rate_correction_factor =

         ((rate_correction_factor * correction_factor) / 100);