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--[[
$Id$

Copyright © 2007-2020 the VideoLAN team

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
--]]

-- Helper function to get a parameter's value in a URL
function get_url_param( url, name )
local _, _, res = string.find( url, "[&?]"..name.."=([^&]*)" )
return res
end

-- Helper function to copy a parameter when building a new URL
function copy_url_param( url, name )
local value = get_url_param( url, name )
return ( value and "&"..name.."="..value or "" ) -- Ternary operator
end

function get_arturl()
local iurl = get_url_param( vlc.path, "iurl" )
if iurl then
return iurl
end
local video_id = get_url_param( vlc.path, "v" )
if not video_id then
return nil
end
return vlc.access.."://img.youtube.com/vi/"..video_id.."/default.jpg"
end

-- Pick the most suited format available
function get_fmt( fmt_list )
local prefres = vlc.var.inherit(nil, "preferred-resolution")
if prefres < 0 then
return nil
end

local fmt = nil
for itag,height in string.gmatch( fmt_list, "(%d+)/%d+x(%d+)[^,]*" ) do
-- Apparently formats are listed in quality
-- order, so we take the first one that works,
-- or fallback to the lowest quality
fmt = itag
if tonumber(height) <= prefres then
break
end
end
return fmt
end

-- Buffering iterator to parse through the HTTP stream several times
-- without making several HTTP requests
function buf_iter( s )
s.i = s.i + 1
local line = s.lines[s.i]
if not line then
-- Put back together statements split across several lines,
-- otherwise we won't be able to parse them
repeat
local l = s.stream:readline()
if not l then break end
..............