Added control over the channel

Author: Jesus Lopez Garcia

jni/osd_dji_overlay_udp.c

@@ -34,6 +34,8 @@
 #include "rec/rec.h"
 #include "rec/rec_pb.h"
 
+#include "util/vtx_managment.c"
+
 #define MSP_PORT 7654
 #define DATA_PORT 7655
 #define COMPRESSED_DATA_PORT 7656
@@ -495,7 +497,7 @@ static void process_data_packet(uint8_t *buf, int len, dji_shm_state_t *radio_sh
         display_print_string(overlay_display_info.char_width - 7, overlay_display_info.char_height - 7, str, 7);
     }
     // TODO: Call channel change HERE!!!!!
-    // changeChannel(packet->fc_vtx_channel);
+    changeChannel(packet->fc_vtx_channel);
     if(len > 6) {
         DEBUG_PRINT("Got new packet with variant %.4s\n", packet->fc_variant);
         // should have FC type

jni/util/vtx_managment.c

@@ -0,0 +1,47 @@
+#include <stdlib.h>
+// #include <stdbool.h>
+// #include <unistd.h>
+#include <dlfcn.h>
+// #include <string.h>
+
+
+
+static void *tp1801_gui_lib = NULL;
+static uint32_t (* setChannelPilotOriginal)(void *this,unsigned short param_1, bool param_2) = 0;
+static uint32_t (* userSettingsGetInstanceOriginal)() = 0;
+static uint32_t userSettingsInstance = 0;
+
+void changeChannel(uint16_t channelIdx) {
+    //Load SetPilotChannel original
+    setChannelPilotOriginal = dlsym (RTLD_NEXT, "_ZN17GlassUserSettings15setPilotChannelEtb");
+    if (setChannelPilotOriginal == NULL) {
+        if(!tp1801_gui_lib){
+            tp1801_gui_lib = dlopen("/system/lib/libtp1801_gui.so", 1);
+        }
+        setChannelPilotOriginal = dlsym (tp1801_gui_lib, "_ZN17GlassUserSettings15setPilotChannelEtb");
+        if (setChannelPilotOriginal == NULL)
+        {
+            printf("dlsym: %s\n", dlerror());
+            return;
+        }
+    }
+
+    //Load UserSettingGetInstance original
+    userSettingsGetInstanceOriginal = dlsym (tp1801_gui_lib, "_ZN17GlassUserSettings11getInstanceEv");
+    if (userSettingsGetInstanceOriginal == NULL)
+    {
+        printf("dlsym: %s\n", dlerror());
+        return;
+    }
+
+    //Get the intance from the previous method
+    if(!userSettingsInstance) userSettingsInstance = userSettingsGetInstanceOriginal();
+	if(!userSettingsInstance) {
+        printf("dlsym: %s\n", dlerror());
+        return;
+    }
+
+    //Do stuff
+    //setChannelPilotOriginal(userSettingsInstance, channelIdx, 1); //Can I pass the instance directly or need to be a function pointer?
+    setChannelPilotOriginal(userSettingsGetInstanceOriginal(), channelIdx, true);
+}