shithub: libvpx

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Use most common segment index for 64x64 level decision

Find the most common segment index among all 16x16 blocks in a
64x64 block and use that as the 64x64 block level decision.

Change-Id: I67e85869d9fee0fc05450928f1eeaebe511cab6a

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

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

@@ -3651,22 +3651,35 @@

       VPXMIN((mi_row + num_8x8_blocks_high_lookup[bsize]) >> 1, cm->mb_rows);

   int mb_col_end =

       VPXMIN((mi_col + num_8x8_blocks_wide_lookup[bsize]) >> 1, cm->mb_cols);

-  int row, col;

+  int row, col, idx;

   int64_t wiener_variance = 0;

   int segment_id;

+  int8_t seg_hist[MAX_SEGMENTS] = { 0 };

+  int8_t max_count = 0, max_index = -1;

   vpx_clear_system_state();

   assert(cpi->norm_wiener_variance > 0);

-  for (row = mb_row_start; row < mb_row_end; ++row)

-    for (col = mb_col_start; col < mb_col_end; ++col)

-      wiener_variance += cpi->mb_wiener_variance[row * cm->mb_cols + col];

+  for (row = mb_row_start; row < mb_row_end; ++row) {

+    for (col = mb_col_start; col < mb_col_end; ++col) {

+      wiener_variance = cpi->mb_wiener_variance[row * cm->mb_cols + col];

+      segment_id =

+          vp9_get_group_idx(log_wiener_var(wiener_variance),

+                            cpi->kmeans_boundary_ls, cpi->kmeans_ctr_num);

+      ++seg_hist[segment_id];

+    }

+  }

-  wiener_variance /= (mb_row_end - mb_row_start) * (mb_col_end - mb_col_start);

+  for (idx = 0; idx < cpi->kmeans_ctr_num; ++idx) {

+    if (seg_hist[idx] > max_count) {

+      max_count = seg_hist[idx];

+      max_index = idx;

+    }

+  }

-  segment_id = vp9_get_group_idx(log_wiener_var(wiener_variance),

-                                 cpi->kmeans_boundary_ls, cpi->kmeans_ctr_num);

+  assert(max_index >= 0);

+  segment_id = max_index;

   return segment_id;

 }