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392 lines
14 KiB
392 lines
14 KiB
--[[
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$Id$
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Copyright © 2007-2013 the VideoLAN team
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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--]]
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-- Helper function to get a parameter's value in a URL
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function get_url_param( url, name )
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local _, _, res = string.find( url, "[&?]"..name.."=([^&]*)" )
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return res
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end
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function get_arturl()
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local iurl = get_url_param( vlc.path, "iurl" )
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if iurl then
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return iurl
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end
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local video_id = get_url_param( vlc.path, "v" )
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if not video_id then
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return nil
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end
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return "http://img.youtube.com/vi/"..video_id.."/default.jpg"
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end
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function get_prefres()
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local prefres = -1
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if vlc.var and vlc.var.inherit then
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prefres = vlc.var.inherit(nil, "preferred-resolution")
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if prefres == nil then
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prefres = -1
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end
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end
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return prefres
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end
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-- Pick the most suited format available
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function get_fmt( fmt_list )
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local prefres = get_prefres()
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if prefres < 0 then
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return nil
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end
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local fmt = nil
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for itag,height in string.gmatch( fmt_list, "(%d+)/%d+x(%d+)/[^,]+" ) do
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-- Apparently formats are listed in quality
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-- order, so we take the first one that works,
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-- or fallback to the lowest quality
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fmt = itag
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if tonumber(height) <= prefres then
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break
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end
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end
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return fmt
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end
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-- Descramble the URL signature using the javascript code that does that
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-- in the web page
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function js_descramble( sig, js_url )
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-- Fetch javascript code
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local js = vlc.stream( js_url )
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if not js then
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return sig
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end
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local lines = {}
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-- Look for the descrambler function's name
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local descrambler = nil
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while not descrambler do
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local line = js:readline()
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if not line then
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vlc.msg.err( "Couldn't process youtube video URL, please check for updates to this script" )
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return sig
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end
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-- Buffer lines for later, so we don't have to make a second
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-- HTTP request later
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table.insert( lines, line )
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-- c&&(b.signature=ij(c));
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descrambler = string.match( line, "%.signature=(.-)%(" )
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end
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-- Fetch the code of the descrambler function. Example:
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-- function ij(a){a=a.split("");a=a.reverse();a=jj(a,12);a=jj(a,32);a=a.reverse();a=jj(a,34);a=a.slice(3);a=jj(a,35);a=jj(a,42);a=a.slice(2);return a.join("")}
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local rules = nil
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while not rules do
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local line
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if #lines > 0 then
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line = table.remove( lines )
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else
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line = js:readline()
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if not line then
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vlc.msg.err( "Couldn't process youtube video URL, please check for updates to this script" )
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return sig
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end
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end
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rules = string.match( line, "function "..descrambler.."%([^)]*%){(.-)}" )
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end
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-- Parse descrambling rules one by one and apply them on the
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-- signature as we go
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for rule in string.gmatch( rules, "[^;]+" ) do
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-- a=a.reverse();
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if string.match( rule, "%.reverse%(" ) then
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sig = string.reverse( sig )
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else
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-- a=a.slice(3);
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local len = string.match( rule, "%.slice%((%d+)%)" )
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if len then
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sig = string.sub( sig, len + 1 )
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else
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-- a=jj(a,32);
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-- This is known to be a function swapping the first and nth
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-- characters:
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-- function jj(a,b){var c=a[0];a[0]=a[b%a.length];a[b]=c;return a}
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local idx = string.match( rule, "=..%([^,]+,(%d+)%)" )
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if idx then
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idx = tonumber( idx )
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if not idx then idx = 0 end
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if idx > 1 then
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sig = string.gsub( sig, "^(.)("..string.rep( ".", idx - 1 )..")(.)(.*)$", "%3%2%1%4" )
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elseif idx == 1 then
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sig = string.gsub( sig, "^(.)(.)", "%2%1" )
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end
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end end end
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-- Simply ignore other statements, in particular initial split
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-- and final join and return statements
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end
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return sig
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end
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function descramble81( sig )
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sig = string.reverse( sig )
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local s1,s2,s3,s4,s5,s6,s7,s8,s9,s10,s11,s12,s13 =
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string.match( sig, "(.)(.......................)(.)(..............)(.)(......)(.)(....)(.)(...................)(.)(........)(.)" )
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return s3..s2..s5..s4..s1..s6..s13..s8..s7..s10..s9..s12..s11
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end
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local descramblers = {
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--[81] = descramble81
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}
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function descramble( sig, js_url )
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vlc.msg.dbg( "Found "..string.len( sig ).."-character scrambled signature for youtube video URL, attempting to descramble... " )
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if js_url then
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sig = js_descramble( sig, js_url )
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else
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local descrambler = descramblers[string.len( sig )]
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if descrambler then
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sig = descrambler( sig )
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else
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vlc.msg.err( "Couldn't process youtube video URL, please check for updates to this script" )
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end
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end
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return sig
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end
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-- Parse and pick our video URL
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function pick_url( url_map, fmt, js_url )
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local path = nil
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for stream in string.gmatch( url_map, "[^,]+" ) do
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-- Apparently formats are listed in quality order,
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-- so we can afford to simply take the first one
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local itag = string.match( stream, "itag=(%d+)" )
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if not fmt or not itag or tonumber( itag ) == tonumber( fmt ) then
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local url = string.match( stream, "url=([^&,]+)" )
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if url then
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url = vlc.strings.decode_uri( url )
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local sig = string.match( stream, "sig=([^&,]+)" )
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if not sig then
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-- Scrambled signature
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sig = string.match( stream, "s=([^&,]+)" )
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if sig then
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sig = descramble( sig, js_url )
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end
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end
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local signature = ""
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if sig then
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signature = "&signature="..sig
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end
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path = url..signature
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break
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end
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end
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end
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return path
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end
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-- Probe function.
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function probe()
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if vlc.access ~= "http" and vlc.access ~= "https" then
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return false
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end
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youtube_site = string.match( string.sub( vlc.path, 1, 8 ), "youtube" )
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if not youtube_site then
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-- FIXME we should be using a builtin list of known youtube websites
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-- like "fr.youtube.com", "uk.youtube.com" etc..
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youtube_site = string.find( vlc.path, ".youtube.com" )
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if youtube_site == nil then
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return false
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end
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end
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return ( string.match( vlc.path, "/watch%?" ) -- the html page
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or string.match( vlc.path, "/get_video_info%?" ) -- info API
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or string.match( vlc.path, "/v/" ) -- video in swf player
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or string.match( vlc.path, "/player2.swf" ) ) -- another player url
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end
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-- Parse function.
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function parse()
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if string.match( vlc.path, "/watch%?" )
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then -- This is the HTML page's URL
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-- fmt is the format of the video
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-- (cf. http://en.wikipedia.org/wiki/YouTube#Quality_and_codecs)
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fmt = get_url_param( vlc.path, "fmt" )
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while true do
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-- Try to find the video's title
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line = vlc.readline()
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if not line then break end
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if string.match( line, "<meta name=\"title\"" ) then
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_,_,name = string.find( line, "content=\"(.-)\"" )
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name = vlc.strings.resolve_xml_special_chars( name )
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name = vlc.strings.resolve_xml_special_chars( name )
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end
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if string.match( line, "<meta name=\"description\"" ) then
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-- Don't ask me why they double encode ...
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_,_,description = string.find( line, "content=\"(.-)\"" )
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description = vlc.strings.resolve_xml_special_chars( description )
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description = vlc.strings.resolve_xml_special_chars( description )
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end
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if string.match( line, "<meta property=\"og:image\"" ) then
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_,_,arturl = string.find( line, "content=\"(.-)\"" )
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end
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-- This is not available in the video parameters (whereas it
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-- is given by the get_video_info API as the "author" field)
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if not artist then
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artist = string.match( line, "yt%-uix%-sessionlink yt%-user%-name[^>]*>([^<]*)</" )
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if artist then
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artist = vlc.strings.resolve_xml_special_chars( artist )
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end
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end
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-- JSON parameters, also formerly known as "swfConfig",
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-- "SWF_ARGS", "swfArgs", "PLAYER_CONFIG", "playerConfig" ...
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if string.match( line, "ytplayer%.config" ) then
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local js_url = string.match( line, "\"js\": \"(.-)\"" )
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if js_url then
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js_url = string.gsub( js_url, "\\/", "/" )
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end
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if not fmt then
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fmt_list = string.match( line, "\"fmt_list\": \"(.-)\"" )
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if fmt_list then
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fmt_list = string.gsub( fmt_list, "\\/", "/" )
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fmt = get_fmt( fmt_list )
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end
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end
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url_map = string.match( line, "\"url_encoded_fmt_stream_map\": \"(.-)\"" )
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if url_map then
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-- FIXME: do this properly
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url_map = string.gsub( url_map, "\\u0026", "&" )
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path = pick_url( url_map, fmt, js_url )
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end
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if not path then
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-- If this is a live stream, the URL map will be empty
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-- and we get the URL from this field instead
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local hlsvp = string.match( line, "\"hlsvp\": \"(.-)\"" )
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if hlsvp then
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hlsvp = string.gsub( hlsvp, "\\/", "/" )
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path = hlsvp
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end
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end
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-- There is also another version of the parameters, encoded
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-- differently, as an HTML attribute of an <object> or <embed>
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-- tag; but we don't need it now
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end
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end
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if not path then
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local video_id = get_url_param( vlc.path, "v" )
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if video_id then
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if fmt then
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format = "&fmt=" .. fmt
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else
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format = ""
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end
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-- Without "el=detailpage", /get_video_info fails for many
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-- music videos with errors about copyrighted content being
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-- "restricted from playback on certain sites"
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path = "http://www.youtube.com/get_video_info?video_id="..video_id..format.."&el=detailpage"
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vlc.msg.warn( "Couldn't extract video URL, falling back to alternate youtube API" )
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end
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end
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if not path then
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vlc.msg.err( "Couldn't extract youtube video URL, please check for updates to this script" )
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return { }
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end
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if not arturl then
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arturl = get_arturl()
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end
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return { { path = path; name = name; description = description; artist = artist; arturl = arturl } }
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elseif string.match( vlc.path, "/get_video_info%?" ) then -- video info API
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local line = vlc.readline() -- data is on one line only
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local fmt = get_url_param( vlc.path, "fmt" )
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if not fmt then
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local fmt_list = string.match( line, "&fmt_list=([^&]*)" )
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if fmt_list then
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fmt_list = vlc.strings.decode_uri( fmt_list )
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fmt = get_fmt( fmt_list )
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end
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end
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local url_map = string.match( line, "&url_encoded_fmt_stream_map=([^&]*)" )
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if url_map then
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url_map = vlc.strings.decode_uri( url_map )
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path = pick_url( url_map, fmt )
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end
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if not path then
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-- If this is a live stream, the URL map will be empty
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-- and we get the URL from this field instead
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local hlsvp = string.match( line, "&hlsvp=([^&]*)" )
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if hlsvp then
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hlsvp = vlc.strings.decode_uri( hlsvp )
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path = hlsvp
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end
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end
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if not path then
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vlc.msg.err( "Couldn't extract youtube video URL, please check for updates to this script" )
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return { }
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end
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local title = string.match( line, "&title=([^&]*)" )
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if title then
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title = string.gsub( title, "+", " " )
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title = vlc.strings.decode_uri( title )
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end
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local artist = string.match( line, "&author=([^&]*)" )
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if artist then
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artist = string.gsub( artist, "+", " " )
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artist = vlc.strings.decode_uri( artist )
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end
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local arturl = string.match( line, "&thumbnail_url=([^&]*)" )
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if arturl then
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arturl = vlc.strings.decode_uri( arturl )
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end
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return { { path = path, title = title, artist = artist, arturl = arturl } }
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else -- This is the flash player's URL
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video_id = get_url_param( vlc.path, "video_id" )
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if not video_id then
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_,_,video_id = string.find( vlc.path, "/v/([^?]*)" )
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end
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if not video_id then
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vlc.msg.err( "Couldn't extract youtube video URL" )
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return { }
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end
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fmt = get_url_param( vlc.path, "fmt" )
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if fmt then
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format = "&fmt=" .. fmt
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else
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format = ""
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end
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return { { path = "http://www.youtube.com/watch?v="..video_id..format } }
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end
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end
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