Remove frame type dependency in od_pvq_rate

In Daala, od_pvq_rate depended on the frame type because of H/V pred.
However, H/V pred is not in AV1, as such this code can be removed.

This changes do not impact the bitstream as currently is_keyframe is
hard coded to zero.

Change-Id: Ic4b7c91c004133bc4520870ce39e47cd6a63f298

av1/encoder/pvq_encoder.c

diff --git a/av1/encoder/pvq_encoder.c b/av1/encoder/pvq_encoder.c
index eec20bd..edf9810 100644
--- a/av1/encoder/pvq_encoder.c
+++ b/av1/encoder/pvq_encoder.c
@@ -221,8 +221,7 @@
 }
 
 static double od_pvq_rate(int qg, int icgr, int theta, int ts,
- const od_adapt_ctx *adapt, const od_coeff *y0, int k, int n,
- int is_keyframe, int pli, int speed) {
+  const od_adapt_ctx *adapt, const od_coeff *y0, int k, int n, int speed) {
   double rate;
   if (k == 0) rate = 0;
   else if (speed > 0) {
@@ -264,11 +263,6 @@
   if (qg > 0 && theta >= 0) {
     /* Approximate cost of entropy-coding theta */
     rate += .9*OD_LOG2(ts);
-    /* Adding a cost to using the H/V pred because it's going to be off
-       most of the time. Cost is optimized on subset1, while making
-       sure we don't hurt the checkerboard image too much.
-       FIXME: Do real RDO instead of this arbitrary cost. */
-    if (is_keyframe && pli == 0) rate += 6;
     if (qg == icgr) rate -= .5;
   }
   return rate;
@@ -405,7 +399,7 @@
   dist = gain_weight*cg*cg*OD_CGAIN_SCALE_2;
   best_dist = dist;
   best_cost = dist + pvq_norm_lambda*od_pvq_rate(0, 0, -1, 0, adapt, NULL, 0,
-   n, is_keyframe, pli, speed);
+    n, speed);
   noref = 1;
   best_k = 0;
   *itheta = -1;
@@ -432,7 +426,7 @@
       best_dist *= OD_CGAIN_SCALE_2;
     }
     best_cost = best_dist + pvq_norm_lambda*od_pvq_rate(0, icgr, 0, 0, adapt,
-     NULL, 0, n, is_keyframe, pli, speed);
+     NULL, 0, n, speed);
     best_qtheta = 0;
     *itheta = 0;
     *max_theta = 0;
@@ -538,7 +532,7 @@
       dist *= OD_CGAIN_SCALE_2;
       /* Do approximate RDO. */
       cost = dist + pvq_norm_lambda*od_pvq_rate(i, icgr, j, ts, adapt, y_tmp,
-       k, n, is_keyframe, pli, speed);
+       k, n, speed);
       if (cost < best_cost) {
         best_cost = cost;
         best_dist = dist;
@@ -581,7 +575,7 @@
       dist *= OD_CGAIN_SCALE_2;
       /* Do approximate RDO. */
       cost = dist + pvq_norm_lambda*od_pvq_rate(i, 0, -1, 0, adapt, y_tmp, k,
-       n, is_keyframe, pli, speed);
+       n, speed);
       if (cost <= best_cost) {
         best_cost = cost;
         best_dist = dist;