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--[[ This code is public domain (since it really isn't very interesting) ]]--
module("common",package.seeall)
-- Iterate over a table in the keys' alphabetical order
function pairs_sorted(t)
local s = {}
for k,_ in pairs(t) do table.insert(s,k) end
table.sort(s)
local i = 0
return function () i = i + 1; return s[i], t[s[i]] end
end
-- Return a function such as skip(foo)(a,b,c) = foo(b,c)
function skip(foo)
return function(discard,...) return foo(...) end
end
-- Return a function such as setarg(foo,a)(b,c) = foo(a,b,c)
function setarg(foo,a)
return function(...) return foo(a,...) end
end
-- Trigger a hotkey
function hotkey(arg)
local id = vlc.misc.action_id( arg )
if id ~= nil then
vlc.var.set( vlc.object.libvlc(), "key-action", id )
return true
else
return false
end
end
-- Take a video snapshot
function snapshot()
local vout = vlc.object.vout()
if not vout then return end
vlc.var.set(vout,"video-snapshot",nil)
end
-- Naive (non recursive) table copy
function table_copy(t)
c = {}
for i,v in pairs(t) do c[i]=v end
return c
end
-- tonumber() for decimals number, using a dot as decimal separator
-- regardless of the system locale
function us_tonumber(str)
local s, i, d = string.match(str, "^([+-]?)(%d*)%.?(%d*)$")
if not s or not i or not d then
return nil
end
if s == "-" then
s = -1
else
s = 1
end
if i == "" then
i = "0"
end
if d == nil or d == "" then
d = "0"
end
return s * (tonumber(i) + tonumber(d)/(10^string.len(d)))
end
-- tostring() for decimals number, using a dot as decimal separator
-- regardless of the system locale
function us_tostring(n)
s = tostring(n):gsub(",", ".", 1)
return s
end
-- strip leading and trailing spaces
function strip(str)
return string.gsub(str, "^%s*(.-)%s*$", "%1")
end
-- print a table (recursively)
function table_print(t,prefix)
local prefix = prefix or ""
if not t then
print(prefix.."/!\\ nil")
return
end
for a,b in pairs_sorted(t) do
print(prefix..tostring(a),b)
if type(b)==type({}) then
table_print(b,prefix.."\t")
end
end
end
-- print the list of callbacks registered in lua
-- useful for debug purposes
function print_callbacks()
print "callbacks:"
table_print(vlc.callbacks)
end
-- convert a duration (in seconds) to a string
function durationtostring(duration)
return string.format("%02d:%02d:%02d",
math.floor(duration/3600),
math.floor(duration/60)%60,
math.floor(duration%60))
end
-- realpath
function realpath(path)
return string.gsub(string.gsub(string.gsub(string.gsub(path,"/%.%./[^/]+","/"),"/[^/]+/%.%./","/"),"/%./","/"),"//","/")
end
-- parse the time from a string and return the seconds
-- time format: [+ or -][<int><H or h>:][<int><M or m or '>:][<int><nothing or S or s or ">]
function parsetime(timestring)
local seconds = 0
local hourspattern = "(%d+)[hH]"
local minutespattern = "(%d+)[mM']"
local secondspattern = "(%d+)[sS\"]?$"
local _, _, hoursmatch = string.find(timestring, hourspattern)
if hoursmatch ~= nil then
seconds = seconds + tonumber(hoursmatch) * 3600
end
local _, _, minutesmatch = string.find(timestring, minutespattern)
if minutesmatch ~= nil then
seconds = seconds + tonumber(minutesmatch) * 60
end
local _, _, secondsmatch = string.find(timestring, secondspattern)
if secondsmatch ~= nil then
seconds = seconds + tonumber(secondsmatch)
end
if string.sub(timestring,1,1) == "-" then
seconds = seconds * -1
end
return seconds
end
-- seek
function seek(value)
local input = vlc.object.input()
if input ~= nil and value ~= nil then
if string.sub(value,-1) == "%" then
local number = us_tonumber(string.sub(value,1,-2))
if number ~= nil then
local posPercent = number/100
if string.sub(value,1,1) == "+" or string.sub(value,1,1) == "-" then
vlc.var.set(input,"position",vlc.var.get(input,"position") + posPercent)
else
vlc.var.set(input,"position",posPercent)
end
end
else
local posTime = parsetime(value)
if string.sub(value,1,1) == "+" or string.sub(value,1,1) == "-" then
vlc.var.set(input,"time",vlc.var.get(input,"time") + posTime)
else
vlc.var.set(input,"time",posTime)
end
end
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
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