Adding DEFAULT_PRED_PROB_{0, 1, 2} constants.

Also using ALLOWED_REFS_PER_FRAME instead of 3.

Change-Id: I810dd8521d8138edb9dbd78edede49b62f706554

vp9/common/vp9_alloccommon.c

@@ -85,7 +85,7 @@ int vp9_alloc_frame_buffers(VP9_COMMON *oci, int width, int height) {
   oci->new_fb_idx = NUM_YV12_BUFFERS - 1;
   oci->fb_idx_ref_cnt[oci->new_fb_idx] = 1;
 
-  for (i = 0; i < 3; i++)
+  for (i = 0; i < ALLOWED_REFS_PER_FRAME; i++)
     oci->active_ref_idx[i] = i;
 
   for (i = 0; i < NUM_REF_FRAMES; i++) {

vp9/common/vp9_blockd.h

@@ -26,6 +26,10 @@
 #define MB_FEATURE_TREE_PROBS   3
 #define PREDICTION_PROBS 3
 
+#define DEFAULT_PRED_PROB_0 120
+#define DEFAULT_PRED_PROB_1 80
+#define DEFAULT_PRED_PROB_2 40
+
 #define MBSKIP_CONTEXTS 3
 
 #define MAX_MB_SEGMENTS         4

vp9/common/vp9_entropymode.c

@@ -364,9 +364,9 @@ void vp9_init_mbmode_probs(VP9_COMMON *x) {
 #if CONFIG_COMP_INTERINTRA_PRED
   x->fc.interintra_prob = VP9_DEF_INTERINTRA_PROB;
 #endif
-  x->ref_pred_probs[0] = 120;
-  x->ref_pred_probs[1] = 80;
-  x->ref_pred_probs[2] = 40;
+  x->ref_pred_probs[0] = DEFAULT_PRED_PROB_0;
+  x->ref_pred_probs[1] = DEFAULT_PRED_PROB_1;
+  x->ref_pred_probs[2] = DEFAULT_PRED_PROB_2;
 }
 
 

vp9/decoder/vp9_decodframe.c

@@ -1170,9 +1170,9 @@ static void setup_pred_probs(VP9_COMMON *pc, vp9_reader *r) {
   // reference frame
   if (pc->frame_type == KEY_FRAME) {
     // Set the prediction probabilities to defaults
-    pc->ref_pred_probs[0] = 120;
-    pc->ref_pred_probs[1] = 80;
-    pc->ref_pred_probs[2] = 40;
+    pc->ref_pred_probs[0] = DEFAULT_PRED_PROB_0;
+    pc->ref_pred_probs[1] = DEFAULT_PRED_PROB_1;
+    pc->ref_pred_probs[2] = DEFAULT_PRED_PROB_2;
   } else {
     int i;
     for (i = 0; i < PREDICTION_PROBS; ++i)

vp9/encoder/vp9_onyx_if.c

@@ -3974,13 +3974,13 @@ int vp9_get_compressed_data(VP9_PTR ptr, unsigned int *frame_flags,
   cm->frame_type = INTER_FRAME;
   cm->frame_flags = *frame_flags;
 
-  /* Reset the frame pointers to the current frame size */
+  // Reset the frame pointers to the current frame size
   vp8_yv12_realloc_frame_buffer(&cm->yv12_fb[cm->new_fb_idx],
                                 cm->width, cm->height,
                                 VP9BORDERINPIXELS);
 
-  /* Calculate scaling factors for each of the 3 available references */
-  for (i = 0; i < 3; ++i) {
+  // Calculate scaling factors for each of the 3 available references
+  for (i = 0; i < ALLOWED_REFS_PER_FRAME; ++i) {
     if (cm->active_ref_idx[i] >= NUM_YV12_BUFFERS) {
       memset(&cm->active_ref_scale[i], 0, sizeof(cm->active_ref_scale[i]));
       continue;