st/prober: Add remote loading

src/xrt/state_trackers/prober/p_json.c

@@ -177,6 +177,8 @@ parse_active(const char *str,
 		*out_active = P_ACTIVE_CONFIG_NONE;
 	} else if (strcmp(str, "tracking") == 0) {
 		*out_active = P_ACTIVE_CONFIG_TRACKING;
+	} else if (strcmp(str, "remote") == 0) {
+		*out_active = P_ACTIVE_CONFIG_REMOTE;
 	} else {
 		fprintf(stderr, "Unknown active config '%s' from %s.\n", str,
 		        from);
@@ -205,6 +207,35 @@ p_json_get_active(struct prober *p, enum p_active_config *out_active)
 	parse_active(tmp, "json", out_active);
 }
 
+bool
+p_json_get_remote_port(struct prober *p, int *out_port)
+{
+	cJSON *t = cJSON_GetObjectItemCaseSensitive(p->json.root, "remote");
+	if (t == NULL) {
+		fprintf(stderr, "No remote node\n");
+		return false;
+	}
+
+	int ver = -1;
+	if (!get_obj_int(t, "version", &ver)) {
+		fprintf(stderr, "Missing version tag!\n");
+		return false;
+	}
+	if (ver >= 1) {
+		fprintf(stderr, "Unknown version tag '%i'!\n", ver);
+		return false;
+	}
+
+	int port = 0;
+	if (!get_obj_int(t, "port", &port)) {
+		return false;
+	}
+
+	*out_port = port;
+
+	return true;
+}
+
 bool
 p_json_get_tracking_settings(struct prober *p, struct xrt_settings_tracking *s)
 {

src/xrt/state_trackers/prober/p_prober.c

@@ -7,6 +7,8 @@
  * @ingroup st_prober
  */
 
+#include "xrt/xrt_config_drivers.h"
+
 #include "util/u_var.h"
 #include "util/u_misc.h"
 #include "util/u_json.h"
@@ -18,6 +20,10 @@
 #include "v4l2/v4l2_interface.h"
 #endif
 
+#ifdef XRT_BUILD_DRIVER_REMOTE
+#include "remote/r_interface.h"
+#endif
+
 #include <stdio.h>
 #include <string.h>
 #include <assert.h>
@@ -651,6 +657,27 @@ add_from_auto_probers(struct prober *p,
 	}
 }
 
+static void
+add_from_remote(struct prober *p,
+                struct xrt_device **xdevs,
+                size_t num_xdevs,
+                bool *have_hmd)
+{
+	if (num_xdevs < 3) {
+		return;
+	}
+
+#ifdef XRT_BUILD_DRIVER_REMOTE
+	int port = 4242;
+	if (!p_json_get_remote_port(p, &port)) {
+		port = 4242;
+	}
+
+	r_create_devices(port, &xdevs[0], &xdevs[1], &xdevs[2]);
+	*have_hmd = xdevs[0] != NULL;
+#endif
+}
+
 static int
 select_device(struct xrt_prober *xp,
               struct xrt_device **xdevs,
@@ -668,6 +695,9 @@ select_device(struct xrt_prober *xp,
 		add_from_devices(p, xdevs, num_xdevs, &have_hmd);
 		add_from_auto_probers(p, xdevs, num_xdevs, &have_hmd);
 		break;
+	case P_ACTIVE_CONFIG_REMOTE:
+		add_from_remote(p, xdevs, num_xdevs, &have_hmd);
+		break;
 	default: assert(false);
 	}
 

src/xrt/state_trackers/prober/p_prober.h

@@ -67,6 +67,7 @@ enum p_active_config
 {
 	P_ACTIVE_CONFIG_NONE = 0,
 	P_ACTIVE_CONFIG_TRACKING = 1,
+	P_ACTIVE_CONFIG_REMOTE = 2,
 };
 
 #ifdef XRT_OS_LINUX
@@ -220,6 +221,14 @@ p_json_get_active(struct prober *p, enum p_active_config *out_active);
 bool
 p_json_get_tracking_settings(struct prober *p, struct xrt_settings_tracking *s);
 
+/*!
+ * Extract remote settings from the JSON.
+ *
+ * @public @memberof prober
+ */
+bool
+p_json_get_remote_port(struct prober *p, int *out_port);
+
 /*!
  * Dump the given device to stdout.
  *