Add new common.volume(). Understands use of strings like "+10", "-10" or "10" for relative or absolute volume changes. Fixes volume in http interface.

share/lua/http/requests/status.xml

@@ -89,7 +89,7 @@ elseif command == "fullscreen" then
 elseif command == "snapshot" then
   common.snapshot()
 elseif command == "volume" then
-  vlc.volume.set(tonumber(val))
+  common.volume(val)
 elseif command == "seek" then
   common.seek(val)
 elseif command == "key" then

share/lua/intf/modules/common.lua

@@ -85,3 +85,11 @@ function seek(value)
         vlc.var.set(input,"time",tonumber(value))
     end
 end
+
+function volume(value)
+    if type(value)=="string" and string.sub(value,1,1) == "+" or string.sub(value,1,1) == "-" then
+        vlc.volume.set(vlc.volume.get()+tonumber(value))
+    else
+        vlc.volume.set(tostring(value))
+    end
+end

share/lua/intf/rc.lua

@@ -397,7 +397,7 @@ end
 
 function volume(name,client,value)
     if value then
-        vlc.volume.set(value)
+        common.volume(value)
     else
         client:append(tostring(vlc.volume.get()))
     end