Posted: 3/26/2016 3:53 AM
Post subject: lsnes: Input movies and save states within Lua
Quote
SineSwiper
Joined: 4/16/2013
Posts: 8
The save state support in lsnes for Lua is a strange beast. The movie.* section has 
Language: lua
movie.unsafe_rewind( movie.to_rewind(filename) )
to be able to load a save state, but nothing to save a save state. It has INPUTMOVIE to read/write/edit input movies, but you can't actually load them into the active state, as they are just input files. The UNSAFEREWIND class's only function appears to be sending it to unsafe_rewind. Funny, there's actually a ZIPWRITER class, but I don't think Lua has enough access to all of the save state files to roll your own state writer. Yes, I know about the 
Language: lua
exec("save-state " .. filename)
command, which is what I'm using now, but that seems like an API of last resort. Are there plans to fill in these gaps? Am I missing some new functions or something obvious?
Posted: 3/26/2016 4:02 PM
Quote
TASeditor
Editor, Skilled player (1538)
Joined: 7/9/2010
Posts: 1319
Glitchy TAS of 2015 NES TASer of 2014 Speedy TAS of 2014 NES TAS of 2013
Use 
exec("save-state movieslot<slot>.lsmv")
to save states and 
exec("load-state movieslot<slot>.lsmv")
to load states.
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Posted: 3/26/2016 6:44 PM
Quote
Amaraticando
It/Its
Editor, Player (162)
Joined: 1/10/2012
Posts: 673
Location: Brazil
TAS of 2015 SNES TAS of 2015
Beware that the whole unsafe rewind thing is to load states faster, without some sanity checks. Using this unproperly could result in a desync. Lua has no access to all the save states files because they can be saved on arbitrary places. The default place to save states is set under Config > Settings > Advanced > Path Save Slots. The prefix of movies and saves can be chosen while creating a new movie. Loading inputmovie object from lsmv file without loading the state: cannot yet. Hacky way that Ilari told me at #lsnes IRC: http://codepad.org/i4awK16k Saving non-current-inputmovie object to lsmv file: you can save the input member alone with movie.serialize. Maybe, you can save the complete lsmv with ZIPWRITER and this file. Saving/Loading a state: 
Language: lua
local default_base = settings.get("slotpath")
local slot = 1

-- save:
local cmd = string.format([[save-state %s/movieslot%d.lsmv]], default_base, slot)  -- hack
local cmd = "save-state $SLOT:" .. slot  -- better
exec(cmd)

-- load
local cmd = string.format([[load-state %s/movieslot%d.lsmv]], default_base, slot)
local cmd = "load-state $SLOT:" .. slot  -- better
exec(cmd)