The VideoLAN Forums

Posted: **19 Mar 2017 11:23**

Hi,

I'm trying to make a simple extension that works in the following manner:

1. User presses button and playlist is shuffled and begins playing
2. At the end of the last playlist item, the playlist is shuffled again
3. Playing loops to the start without stopping.

I'd like to loop instead of calling playlist.stop() and playlist.start() because stop brings you back to the playlist UI.

My code is here:

Code: Select all

function descriptor()
	return {
		title = "Shuffle Playlist",
		version = "1.1.1",
		shortdesc = "Shuffle Playlist",
		description = "Shuffles playlists once they are finished",
		author = "Jonathan Mackenzie",
		capabilities = {"playing-listener", "meta-listener", "input-listener"}
	}
end

function activate()
    vlc.playlist.loop('on')
    resetOn = nil
    shuf()
    vlc.playlist.play()
    return true
end

function deactivate()
	vlc.playlist.loop('off')
        vlc.playlist.stop()
	vlc.deactivate()
	return true
end
function close()
    vlc.deactivate()
end

function input_changed()
  -- related to capabilities={"input-listener"} in descriptor()
  -- triggered by Start/Stop media input event
  vlc.msg.dbg("[Shuffle] input changed currentId: " ..vlc.playlist.current())
end


function meta_changed()
   -- related to capabilities={"meta-listener"} in descriptor()
   -- triggered by available media input meta data?
  vlc.msg.dbg("[Shuffle] meta changed currentId : " .. vlc.playlist.current())
  if(vlc.playlist.current()==resetOn) then
    shuf()
  end  
end

function playing_changed()
  vlc.msg.dbg("[Shuffle] playing changed currentId: "..vlc.playlist.current())

end
function shuf()
	math.randomseed(os.time())
	
	local pl = vlc.playlist.get("normal", false)
	local randomList = {}
	
	for i, v in ipairs(pl.children) do
		if v.duration == -1 then v.duration = 0 end
		randomList[#randomList + 1] = v
	end
	
	local swap
	for i = 1, #randomList do 
		swap = math.random(#randomList)
		randomList[i], randomList[swap] = randomList[swap], randomList[i]
	end
	
	vlc.playlist.clear()
	vlc.playlist.enqueue(randomList)
	
    vlc.playlist.goto(randomList[1].id)
    resetOn = randomList[#randomList].id
    
	vlc.msg.dbg("[Shuffle] Playlist shuffled! Reset on id: ".. resetOn)
    return true
end

But the problem is that it doesn't shuffle and start at the end of the playlist (VLC crashes). How can I tell when I get to the end of the last item? I understand meta_changed is called at the end of each item, but how do I actually detect that this is the case?

Posted: **19 Mar 2017 13:30**

I have not checked/tested your script yet, perhaps later. I am not sure whether it is possible to find a reliable dynamic solution. Sampler (PG) introduces a static solution that works. It helps you to generate a shuffled playlist. You can enqueue many feeds to prepare long playlist (some kind of static loop). "Autofeed on last track" option is not reliable there (*remark in HELP).

Posted: **20 Mar 2017 04:30**

After getting some advice on IRC, I came up with the following (turns out you can tell if it's the end of an item by checking it's current time):

Code: Select all

function descriptor()
   return {
      title = "Shuffle Playlist",
      version = "1.1.3",
      shortdesc = "Shuffle Playlist",
      description = "Shuffles playlists once they are finished",
      author = "Jonathan Mackenzie",
      capabilities = {"input-listener", "playing-listener", "meta-listener"}
   }
end

function activate()
    vlc.playlist.loop('on')
    vlc.playlist.play()
    played = {vlc.playlist.current()}
    return true
end

function deactivate()
   vlc.playlist.loop('off')
   vlc.playlist.stop()
   vlc.deactivate()
   return true
end

function close()
    vlc.deactivate()
end

function meta_changed()
   -- related to capabilities={"meta-listener"} in descriptor()
   -- triggered by available media input meta data?
    local current = vlc.playlist.current()
    local input = vlc.object.input()
    local elapsed = vlc.var.get(input, "time")
    local total = vlc.var.get(input, "length")
    local diff = total - elapsed
    if diff <= 0 then
        local found = false
        for id,v in pairs(played) do
            if v == current then found = true end
        end
        if found then
        --if played[current] == true then
            played = {}
            vlc.playlist.sort("random")
            vlc.msg.dbg("[Shuffle] shuffling")
        else
            table.insert(played, current)
            local out = ""
            for id,v in pairs(played) do
                out = out ..v.. " "
            end
            vlc.msg.dbg("[Shuffle] Played: "..out)
        end
    end
   
  -- vlc.msg.dbg("[Shuffle] ".. elapsed.. "/".. total .. " diff= ".. tostring(total - elapsed))
end

function input_changed()

end

function playing_changed()
  --  vlc.msg.dbg("[Shuffle] playing changed to "..vlc.playlist.current())
end

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