Add a cli option to control whether intra cus are tried to combine on the lower depth when search for said depth is disabled

src/cfg.c

@@ -183,6 +183,8 @@ int kvz_config_init(kvz_config *cfg)
   cfg->fastrd_sampling_on = 0;
   cfg->fastrd_accuracy_check_on = 0;
   cfg->fastrd_learning_outdir_fn = NULL;
+
+  cfg->combine_intra_cus = 1;
   return 1;
 }
 
@@ -1421,6 +1423,9 @@ int kvz_config_parse(kvz_config *cfg, const char *name, const char *value)
   else if OPT("stats-file-prefix") {
     cfg->stats_file_prefix = strdup(value);
   }
+  else if OPT("combine-intra-cus") {
+    cfg->combine_intra_cus = atobool(value);
+  }
   else {
     return 0;
   }

src/cli.c

@@ -167,6 +167,8 @@ static const struct option long_options[] = {
   { "fastrd-sampling",          no_argument, NULL, 0 },
   { "fastrd-accuracy-check",    no_argument, NULL, 0 },
   { "fastrd-outdir",      required_argument, NULL, 0 },
+  { "combine-intra-cus",        no_argument, NULL, 0 },
+  { "no-combine-intra-cus",     no_argument, NULL, 0 },
   {0, 0, 0, 0}
 };
 
@@ -578,6 +580,12 @@ void print_help(void)
     "      --ml-pu-depth-intra    : Predict the pu-depth-intra using machine\n"
     "                                learning trees, overrides the\n"
     "                                --pu-depth-intra parameter. [disabled]\n"
+    "      --(no-)combine-intra-cus: Whether the encoder tries to code a cu\n"
+    "                                   on lower depth even when search is not\n"
+    "                                   performed on said depth. Should only\n"
+    "                                   be disabled if cus absolutely must not\n"
+    "                                   be larger than limited by the search.\n"
+    "                                   [enabled]"
     "      --tr-depth-intra <int> : Transform split depth for intra blocks [0]\n"
     "      --(no-)bipred          : Bi-prediction [disabled]\n"
     "      --cu-split-termination <string> : CU split search termination [zero]\n"

src/kvazaar.h

@@ -479,6 +479,9 @@ typedef struct kvz_config
 
   char *fastrd_learning_outdir_fn;
 
+  /** \brief whether to try combining intra cus at the lower depth when search
+   *         is not performed at said depth*/
+  uint8_t combine_intra_cus;
 } kvz_config;
 
 /**

src/search.c

@@ -754,7 +754,8 @@ static double search_cu(encoder_state_t * const state, int x, int y, int depth,
     // gets used, at least in the most obvious cases, while avoiding any
     // searching.
     if (cur_cu->type == CU_NOTSET && depth < MAX_PU_DEPTH
-        && x + cu_width <= frame->width && y + cu_width <= frame->height)
+        && x + cu_width <= frame->width && y + cu_width <= frame->height 
+        && state->encoder_control->cfg.combine_intra_cus)
     {
       cu_info_t *cu_d1 = LCU_GET_CU_AT_PX(&work_tree[depth + 1], x_local, y_local);