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vp9: Adjust thresholds for limiting cyclic refresh for noisy content.

For noisy content, be more aggressive in skippping some blocks for
delta-qp to reduce noise pulsing artifact. Also treat frame boundary
case when dimension is not multiple of superblock size/64.

Only affects non-screen content case, and when source noise
is measured to be high (at least level kMedium).

Change-Id: Ib13a2a20ed1ce37ff3c44d95c3ef2635fd695222

--- a/vp9/encoder/vp9_aq_cyclicrefresh.c

+++ b/vp9/encoder/vp9_aq_cyclicrefresh.c

@@ -383,13 +383,14 @@

           : vp9_get_qindex(&cm->seg, CR_SEGMENT_ID_BOOST1, cm->base_qindex);

   // More aggressive settings for noisy content.

   if (cpi->noise_estimate.enabled && cpi->noise_estimate.level >= kMedium) {

-    consec_zero_mv_thresh = 80;

+    consec_zero_mv_thresh = 60;

     qindex_thresh =

         VPXMAX(vp9_get_qindex(&cm->seg, CR_SEGMENT_ID_BOOST1, cm->base_qindex),

-               7 * cm->base_qindex >> 3);

+               cm->base_qindex);

   }

   do {

     int sum_map = 0;

+    int consec_zero_mv_thresh_block = consec_zero_mv_thresh;

     // Get the mi_row/mi_col corresponding to superblock index i.

     int sb_row_index = (i / sb_cols);

     int sb_col_index = i - sb_row_index * sb_cols;

@@ -403,6 +404,9 @@

         VPXMIN(cm->mi_cols - mi_col, num_8x8_blocks_wide_lookup[BLOCK_64X64]);

     ymis =

         VPXMIN(cm->mi_rows - mi_row, num_8x8_blocks_high_lookup[BLOCK_64X64]);

+    if (cpi->noise_estimate.enabled && cpi->noise_estimate.level >= kMedium &&

+        (xmis <= 2 || ymis <= 2))

+      consec_zero_mv_thresh_block = 10;

     for (y = 0; y < ymis; y++) {

       for (x = 0; x < xmis; x++) {

         const int bl_index2 = bl_index + y * cm->mi_cols + x;

@@ -412,7 +416,7 @@

         if (cr->map[bl_index2] == 0) {

           count_tot++;

           if (cr->last_coded_q_map[bl_index2] > qindex_thresh ||

-              cpi->consec_zero_mv[bl_index2] < consec_zero_mv_thresh) {

+              cpi->consec_zero_mv[bl_index2] < consec_zero_mv_thresh_block) {

             sum_map++;

             count_sel++;

           }