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vp9: Add scene change detection flag to cyclic refresh setup

Disable cyclic refresh on slide/scene change frame. It was already
disabled on the re-encode for the slide change, but this change
makes sure its always disabled on a detected slide change (which
may not be re-encoded at high Q).

Change-Id: I1195c855bca25985d4d41e5b657adf124e901760

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

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

@@ -523,15 +523,19 @@

   const RATE_CONTROL *const rc = &cpi->rc;

   CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;

   struct segmentation *const seg = &cm->seg;

+  int scene_change_detected =

+      cpi->rc.high_source_sad ||

+      (cpi->use_svc && cpi->svc.high_source_sad_superframe);

   if (cm->current_video_frame == 0) cr->low_content_avg = 0.0;

   // Reset if resoluton change has occurred.

   if (cpi->resize_pending != 0) vp9_cyclic_refresh_reset_resize(cpi);

-  if (!cr->apply_cyclic_refresh || (cpi->force_update_segmentation)) {

+  if (!cr->apply_cyclic_refresh || (cpi->force_update_segmentation) ||

+      scene_change_detected) {

     // Set segmentation map to 0 and disable.

     unsigned char *const seg_map = cpi->segmentation_map;

     memset(seg_map, 0, cm->mi_rows * cm->mi_cols);

     vp9_disable_segmentation(&cm->seg);

-    if (cm->frame_type == KEY_FRAME) {

+    if (cm->frame_type == KEY_FRAME || scene_change_detected) {

       memset(cr->last_coded_q_map, MAXQ,

              cm->mi_rows * cm->mi_cols * sizeof(*cr->last_coded_q_map));

       cr->sb_index = 0;