shithub: libvpx

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Add a partition search breakout model

for q-index between 100 and 150.

This only affects speed 1 and 2, resolution under 720p, q-index between
100 and 150, low bit-depth.

Compression performane change is neutral.
Encoding speed gain is up to 16% for speed 1;
                       up to  6% for speed 2.

Results from encoding city_4cif_30fps:
speed 1, QP=36
before:  37.964 dB, 45581b/f, 2.73 fps
after:   37.958 dB, 45510b/f, 3.16 fps

speed 1, QP=28
before:  39.297 dB, 82452b/f, 2.14 fps
after:   39.297 dB, 82310b/f, 2.25 fps

speed 2, QP=36
before:  37.903 dB, 45586b/f, 4.08 fps
after:   37.895 dB, 45492b/f, 4.34 fps

speed 2, QP=28
before:  39.224 dB, 82272b/f, 3.03 fps
after:   39.223 dB, 82152b/f, 3.17 fps

Change-Id: Ieaefedad902df80aa9699545fa06294601955803

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -3319,7 +3319,7 @@

 }

 #define FEATURES 4

-#define Q_CTX 2

+#define Q_CTX 3

 static const float partition_breakout_weights_64[Q_CTX][FEATURES + 1] = {

   {

       -0.016673f,

@@ -3335,6 +3335,13 @@

       0.002448f,

       1.65738142f - 2.5f,

   },

+  {

+      -0.628934f,

+      -0.011459f,

+      -0.000009f,

+      0.013833f,

+      1.47982645f - 1.6f,

+  },

 };

 static const float partition_breakout_weights_32[Q_CTX][FEATURES + 1] = {

@@ -3352,6 +3359,13 @@

       0.009792f,

       1.28089404f - 2.5f,

   },

+  {

+      -0.163097f,

+      -0.013081f,

+      0.000022f,

+      0.019006f,

+      1.36129403f - 3.2f,

+  },

 };

 static const float partition_breakout_weights_16[Q_CTX][FEATURES + 1] = {

@@ -3369,6 +3383,13 @@

       0.008187f,

       2.15043926f - 2.5f,

   },

+  {

+      -0.075755f,

+      -0.010858f,

+      0.000030f,

+      0.024505f,

+      2.06848121f - 2.5f,

+  },

 };

 static const float partition_breakout_weights_8[Q_CTX][FEATURES + 1] = {

@@ -3386,6 +3407,13 @@

       0.013876f,

       1.96755111f - 1.5f,

   },

+  {

+      -0.013522f,

+      -0.008677f,

+      -0.000562f,

+      0.034468f,

+      1.53440356f - 1.5f,

+  },

 };

 // ML-based partition search breakout.

@@ -3398,7 +3426,7 @@

   const float *linear_weights = NULL;  // Linear model weights.

   float linear_score = 0.0f;

   const int qindex = cm->base_qindex;

-  const int q_ctx = qindex >= 200 ? 0 : 1;

+  const int q_ctx = qindex >= 200 ? 0 : (qindex >= 150 ? 1 : 2);

   switch (bsize) {

     case BLOCK_64X64:

@@ -3641,7 +3669,7 @@

           if (!x->e_mbd.lossless && ctx->skippable) {

             int use_ml_based_breakout =

                 cpi->sf.use_ml_partition_search_breakout &&

-                cm->base_qindex >= 150;

+                cm->base_qindex >= 100;

 #if CONFIG_VP9_HIGHBITDEPTH

             if (x->e_mbd.cur_buf->flags & YV12_FLAG_HIGHBITDEPTH)

               use_ml_based_breakout = 0;

--- a/vp9/encoder/vp9_speed_features.c

+++ b/vp9/encoder/vp9_speed_features.c

@@ -85,6 +85,7 @@

       sf->use_ml_partition_search_breakout = 1;

       sf->ml_partition_search_breakout_thresh[0] = 0.0f;

       sf->ml_partition_search_breakout_thresh[1] = 0.0f;

+      sf->ml_partition_search_breakout_thresh[2] = 0.0f;

     }

   }

@@ -101,6 +102,7 @@

       sf->partition_search_breakout_thr.rate = 100;

       sf->ml_partition_search_breakout_thresh[0] = 0.0f;

       sf->ml_partition_search_breakout_thresh[1] = -1.0f;

+      sf->ml_partition_search_breakout_thresh[2] = -4.0f;

     }

     sf->rd_auto_partition_min_limit = set_partition_min_limit(cm);

--- a/vp9/encoder/vp9_speed_features.h

+++ b/vp9/encoder/vp9_speed_features.h

@@ -472,7 +472,7 @@

   // Use ML-based partition search early breakout.

   int use_ml_partition_search_breakout;

-  float ml_partition_search_breakout_thresh[2];

+  float ml_partition_search_breakout_thresh[3];

   // Machine-learning based partition search early termination

   int ml_partition_search_early_termination;