only run system() command when vol has changed (#1148)

* only run system command when vol has changed * fix indent old-commit-hash: 4311550293
5 years ago · 02ad0e743e
parent 3f5d11ff3b
commit 02ad0e743e
1 changed files with 9 additions and 4 deletions
--- a/selfdrive/ui/sound.cc
+++ b/selfdrive/ui/sound.cc
@ -13,12 +13,17 @@ extern "C"{
 #include "slplay.h"
 }

+int last_volume = 0;
+
 void set_volume(int volume) {
-  char volume_change_cmd[64];
-  sprintf(volume_change_cmd, "service call audio 3 i32 3 i32 %d i32 1 &", volume);
+  if (last_volume != volume) {
+    char volume_change_cmd[64];
+    sprintf(volume_change_cmd, "service call audio 3 i32 3 i32 %d i32 1 &", volume);

-  // 5 second timeout at 60fps
-  int volume_changed = system(volume_change_cmd);
+    // 5 second timeout at 60fps
+    int volume_changed = system(volume_change_cmd);
+    last_volume = volume;
+  }
 }