Re: lua and open sound control

["lists@..." <lists@...>]

I'm sure it is pretty basic and poorly designed, since I'm new to  
Lua, but I used Ross Bencina's OSCPACK (http://www.audiomulch.com/ 
~rossb/code/oscpack/) code in an application and bound it to Lua in  
about an hour, such that a function is called in Lua with any  
received OSC message along with type and address info.  Actually most  
of the delay was due to me working on a new McIntel, with little/big  
endian issues.

Here's the core method FYI:

// inherited method from OscPacketListener, defines how to handle OSC  
messages
void OscReceive :: ProcessMessage(const osc::ReceivedMessage& m,  
const IpEndpointName& remoteEndpoint)
{
	try{
		long nargs = m.ArgumentCount();
		osc::ReceivedMessage::const_iterator arg = m.ArgumentsBegin();
		
		lua_State * L = GLua::getInstance()->getLua(); // my global ptr to  
Lua space
		
		// call the 'onosc' function with required arguments
		lua_getglobal(L, "onOSC");		
		
		lua_pushstring(L, m.AddressPattern());
		lua_pushstring(L, m.TypeTags());
		
		for (int i=0; i<nargs; i++)
		{
			std::cout << " ";
			if ((arg)->IsFloat()) {
				lua_pushnumber(L, (double)(arg++)->AsFloat());
				
			} else if ((arg)->IsInt32()) {
				lua_pushnumber(L, (double)(arg++)->AsInt32());
				
			} else if ((arg)->IsChar()) {
				lua_pushnumber(L, (double)(arg++)->AsChar());
				
			} else if ((arg)->IsDouble()) {
				lua_pushnumber(L, (arg++)->AsDouble());
				
			} else if ((arg)->IsString()) {
				lua_pushstring(L, (arg++)->AsString());
				
			} else if ((arg)->IsTimeTag()) {
				lua_pushnumber(L, (double)(arg++)->AsTimeTag());
				
			} else if ((arg)->IsBool()) {
				lua_pushboolean(L, (arg++)->AsBool() ? 1 : 0);
				
			} else if ((arg)->IsNil()) {
				lua_pushnil(L);
				arg++;
				
			} else if ((arg)->IsInt64()) {
				lua_pushnumber(L, (double)(arg++)->AsInt64());
				
			} else if ((arg)->IsSymbol()) {
				lua_pushstring(L, (arg++)->AsSymbol());
				
			} else if ((arg)->IsMidiMessage()) {
				lua_pushnumber(L, (double)(arg++)->AsMidiMessage());
				
			} else {
				lua_pushnil(L);
				arg++;
			}
		}
		
		if (lua_pcall(L, nargs+2, 0, 0) != 0) {	// if there's an error
			ConsoleLua::clua->addLine("error running function 'onosc':");
			ConsoleLua::clua->addLine(lua_tostring(L, -1));			
		}
		
	} catch( osc::Exception& e ){
		// any parsing errors such as unexpected argument types, or
		// missing arguments get thrown as exceptions.
		ConsoleLua::clua->addLine("error receiving OSC:");
		ConsoleLua::clua->addLine(m.AddressPattern());
		ConsoleLua::clua->addLine(e.what());
	}
}


On Apr 18, 2006, at 4:49 PM, Damian Stewart wrote:

> hey everyone,
>
> i'm looking at using OSC (www.opensoundcontrol.org) to communicate  
> between a vision-based interface device and an engine running a lua  
> scripting system. the best way to do this would seem to be to  
> implement the OSC server in Lua and have the interface device  
> operate as an OSC client. the interface device is built in C++, and  
> will likely be reused across other projects not running Lua - hence  
> the decision to use OSC.
>
> i'm completely new to the scripting end of Lua (despite having  
> coded assembly-level bindings to enable lua-driven C++ function  
> calls on a PlayStation2, but that's another story, another project,  
> another company, and at least two years ago ;-) - can anyone give  
> me some starting pointers to look at doing this?
>
> cheers
> d
>
> --
> f r e y
> live music with computers
> http://www.frey.co.nz