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Store a group level noise metric from first pass.

Adds a variable to GF group structure to store a noise
energy metric for the current group that can be used
in things like film grain retention code.

Change-Id: I81b07630d3242f7928110f19a6c1ed4c86125f05

--- a/vp9/encoder/vp9_firstpass.c

+++ b/vp9/encoder/vp9_firstpass.c

@@ -49,7 +49,6 @@

 #define MIN_DECAY_FACTOR 0.01

 #define NEW_MV_MODE_PENALTY 32

 #define DARK_THRESH 64

-#define SECTION_NOISE_DEF 250.0

 #define LOW_I_THRESH 24000

 #define NCOUNT_INTRA_THRESH 8192

@@ -2655,6 +2654,10 @@

   // 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);

+

+  // Store the average moise level measured for the group

+  twopass->gf_group.group_noise_energy =

+      (int)(gf_group_noise / rc->baseline_gf_interval);

   // Calculate an estimate of the maxq needed for the group.

   // We are more aggressive about correcting for sections

--- a/vp9/encoder/vp9_firstpass.h

+++ b/vp9/encoder/vp9_firstpass.h

@@ -44,6 +44,7 @@

 #define INVALID_ROW -1

 #define MAX_ARF_LAYERS 6

+#define SECTION_NOISE_DEF 250.0

 typedef struct {

   double frame_mb_intra_factor;

@@ -142,6 +143,7 @@

   int gf_group_size;

   int max_layer_depth;

   int allowed_max_layer_depth;

+  int group_noise_energy;

 } GF_GROUP;

 typedef struct {