Update class_cdf table once per frame.

Move computing the class_cdf table per coded mv class symbol to
 computing it only when the probabilities are updated.

Change-Id: I6c4a9075817e8ba2e251f0e82436995f08f2ec5c

av1/common/entropymv.c

@@ -50,6 +50,9 @@ static const nmv_context default_nmv_context = {
         // Vertical component
         128,                                                   // sign
         { 224, 144, 192, 168, 192, 176, 192, 198, 198, 245 },  // class
+#if CONFIG_DAALA_EC
+        { 0 },  // class_cdf is computed from class in av1_init_mv_probs()
+#endif
         { 216 },                                               // class0
         { 136, 140, 148, 160, 176, 192, 224, 234, 234, 240 },  // bits
         { { 128, 128, 64 }, { 96, 112, 64 } },                 // class0_fp
@@ -61,6 +64,9 @@ static const nmv_context default_nmv_context = {
         // Horizontal component
         128,                                                   // sign
         { 216, 128, 176, 160, 176, 176, 192, 198, 198, 208 },  // class
+#if CONFIG_DAALA_EC
+        { 0 },  // class_cdf is computed from class in av1_init_mv_probs()
+#endif
         { 208 },                                               // class0
         { 136, 140, 148, 160, 176, 192, 224, 234, 234, 240 },  // bits
         { { 128, 128, 64 }, { 96, 112, 64 } },                 // class0_fp
@@ -265,6 +271,10 @@ void av1_init_mv_probs(AV1_COMMON *cm) {
 #if CONFIG_DAALA_EC
   av1_tree_to_cdf(av1_mv_joint_tree, cm->fc->nmvc.joints,
                   cm->fc->nmvc.joint_cdf);
+  av1_tree_to_cdf(av1_mv_class_tree, cm->fc->nmvc.comps[0].classes,
+                  cm->fc->nmvc.comps[0].class_cdf);
+  av1_tree_to_cdf(av1_mv_class_tree, cm->fc->nmvc.comps[1].classes,
+                  cm->fc->nmvc.comps[1].class_cdf);
 #endif
 #endif
 }

av1/common/entropymv.h

@@ -85,6 +85,9 @@ extern const aom_tree_index av1_mv_fp_tree[];
 typedef struct {
   aom_prob sign;
   aom_prob classes[MV_CLASSES - 1];
+#if CONFIG_DAALA_EC
+  aom_cdf_prob class_cdf[MV_CLASSES];
+#endif
   aom_prob class0[CLASS0_SIZE - 1];
   aom_prob bits[MV_OFFSET_BITS];
   aom_prob class0_fp[CLASS0_SIZE][MV_FP_SIZE - 1];

av1/decoder/decodeframe.c

@@ -240,6 +240,9 @@ static void read_mv_probs(nmv_context *ctx, int allow_hp, aom_reader *r) {
     update_mv_probs(comp_ctx->classes, MV_CLASSES - 1, r);
     update_mv_probs(comp_ctx->class0, CLASS0_SIZE - 1, r);
     update_mv_probs(comp_ctx->bits, MV_OFFSET_BITS, r);
+#if CONFIG_DAALA_EC
+    av1_tree_to_cdf(av1_mv_class_tree, comp_ctx->classes, comp_ctx->class_cdf);
+#endif
   }
 
   for (i = 0; i < 2; ++i) {

av1/decoder/decodemv.c

@@ -548,7 +548,11 @@ static int read_mv_component(aom_reader *r, const nmv_component *mvcomp,
   int mag, d, fr, hp;
   const int sign = aom_read(r, mvcomp->sign, ACCT_STR);
   const int mv_class =
+#if CONFIG_DAALA_EC
+      aom_read_symbol(r, mvcomp->class_cdf, MV_CLASSES, ACCT_STR);
+#else
       aom_read_tree(r, av1_mv_class_tree, mvcomp->classes, ACCT_STR);
+#endif
   const int class0 = mv_class == MV_CLASS_0;
 
   // Integer part

av1/encoder/encodemv.c

@@ -46,8 +46,12 @@ static void encode_mv_component(aom_writer *w, int comp,
   aom_write(w, sign, mvcomp->sign);
 
   // Class
+#if CONFIG_DAALA_EC
+  aom_write_symbol(w, mv_class, mvcomp->class_cdf, MV_CLASSES);
+#else
   av1_write_token(w, av1_mv_class_tree, mvcomp->classes,
                   &mv_class_encodings[mv_class]);
+#endif
 
   // Integer bits
   if (mv_class == MV_CLASS_0) {
@@ -214,6 +218,9 @@ void av1_write_nmv_probs(AV1_COMMON *cm, int usehp, aom_writer *w,
     update_mv(w, comp_counts->sign, &comp->sign, MV_UPDATE_PROB);
     write_mv_update(av1_mv_class_tree, comp->classes, comp_counts->classes,
                     MV_CLASSES, w);
+#if CONFIG_DAALA_EC
+    av1_tree_to_cdf(av1_mv_class_tree, comp->classes, comp->class_cdf);
+#endif
     write_mv_update(av1_mv_class0_tree, comp->class0, comp_counts->class0,
                     CLASS0_SIZE, w);
     for (j = 0; j < MV_OFFSET_BITS; ++j)