Enable various thresholds of motion detection

This commit changed to enable the encoder to adjust motion dection
speed threshold based on picture size. In addition, cpu-used 1 now
does a partition search every other frame instead of every third
frame for low resolution inputs.

The change has no quality/speed impact for 720p and above. Test
showed the change increase encoding time by between 3% to 6% for
cpu-used 2 encodiong of 360p sequences. It also has a compression
gain about .3%.

For cpu-used 2, the change resolved some very disturbing visual
artifacts in certain sequences when large block partitionings and
transforms are used as a result of copying the partition from a
previous frame.

Change-Id: Ic7fd22508cdb811d4ca935655adbf20109286cfa

1 files changed, 9 insertions, 0 deletions

diff --git a/vp9/encoder/vp9_speed_features.h b/vp9/encoder/vp9_speed_features.h
index 46806c9a9..6d2cbb9a9 100644
--- a/vp9/encoder/vp9_speed_features.h
+++ b/vp9/encoder/vp9_speed_features.h
@@ -44,6 +44,11 @@ typedef enum {
 } SUBPEL_SEARCH_METHODS;
 
 typedef enum {
+  NO_MOITION_THRESHOLD = 0,
+  LOW_MOITION_THRESHOLD = 7
+} MOTION_THRESHOLD;
+
+typedef enum {
   LAST_FRAME_PARTITION_OFF = 0,
   LAST_FRAME_PARTITION_LOW_MOTION = 1,
   LAST_FRAME_PARTITION_ALL = 2
@@ -200,6 +205,10 @@ typedef struct SPEED_FEATURES {
   // partitioning.
   LAST_FRAME_PARTITION_METHOD use_lastframe_partitioning;
 
+  // The threshold is to determine how slow the motino is, it is used when
+  // use_lastframe_partitioning is set to LAST_FRAME_PARTITION_LOW_MOTION
+  MOTION_THRESHOLD lf_motion_threshold;
+
   // Determine which method we use to determine transform size. We can choose
   // between options like full rd, largest for prediction size, largest
   // for intra and model coefs for the rest.