Cleaning up calc_active_worst_quality_one_pass_vbr().

Change-Id: Ibfccee5e35c235c02843e1c1fbd3c39034619cf5

vp9/encoder/vp9_ratectrl.c

@@ -462,33 +462,25 @@ static int get_active_quality(int q, int gfu_boost, int low, int high,
 }
 
 static int calc_active_worst_quality_one_pass_vbr(const VP9_COMP *cpi) {
+  const RATE_CONTROL *const rc = &cpi->rc;
+  const unsigned int curr_frame = cpi->common.current_video_frame;
   int active_worst_quality;
+
   if (cpi->common.frame_type == KEY_FRAME) {
-    if (cpi->common.current_video_frame == 0) {
-      active_worst_quality = cpi->rc.worst_quality;
+    active_worst_quality = curr_frame == 0 ? rc->worst_quality
+                                           : rc->last_q[KEY_FRAME] * 2;
   } else {
-      // Choose active worst quality twice as large as the last q.
-      active_worst_quality = cpi->rc.last_q[KEY_FRAME] * 2;
-    }
-  } else if (!cpi->rc.is_src_frame_alt_ref &&
+    if (!rc->is_src_frame_alt_ref &&
         (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
-    if (cpi->common.current_video_frame == 1) {
-      active_worst_quality = cpi->rc.last_q[KEY_FRAME] * 5 / 4;
+      active_worst_quality =  curr_frame == 1 ? rc->last_q[KEY_FRAME] * 5 / 4
+                                              : rc->last_q[INTER_FRAME];
     } else {
-      // Choose active worst quality twice as large as the last q.
-      active_worst_quality = cpi->rc.last_q[INTER_FRAME];
-    }
-  } else {
-    if (cpi->common.current_video_frame == 1) {
-      active_worst_quality = cpi->rc.last_q[KEY_FRAME] * 2;
-    } else {
-      // Choose active worst quality twice as large as the last q.
-      active_worst_quality = cpi->rc.last_q[INTER_FRAME] * 2;
+      active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 2
+                                             : rc->last_q[INTER_FRAME] * 2;
     }
   }
-  if (active_worst_quality > cpi->rc.worst_quality)
-    active_worst_quality = cpi->rc.worst_quality;
-  return active_worst_quality;
+
+  return MIN(active_worst_quality, rc->worst_quality);
 }
 
 // Adjust active_worst_quality level based on buffer level.