share/lua/website/bbc.lua

   1
   2 -- quvi
   3 -- Copyright (C) 2011, 2012  quvi project
   4 --
   5 -- This file is part of quvi <http://quvi.sourceforge.net/>.
   6 --
   7 -- This library is free software; you can redistribute it and/or
   8 -- modify it under the terms of the GNU Lesser General Public
   9 -- License as published by the Free Software Foundation; either
  10 -- version 2.1 of the License, or (at your option) any later version.
  11 --
  12 -- This library is distributed in the hope that it will be useful,
  13 -- but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 -- Lesser General Public License for more details.
  16 --
  17 -- You should have received a copy of the GNU Lesser General Public
  18 -- License along with this library; if not, write to the Free Software
  19 -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20 -- 02110-1301  USA
  21
  22
  23 -- TODO:
  24 -- - Add support for Radio programmes
  25 -- - Add support for live streaming
  26 -- - Better error messages for geolocation errors
  27 -- - Offer the subtitles for download somehow
  28
  29 -- Obtained with grep -oP '(?<=service=")[^"]+(?=")' on config
  30 local fmt_id_lookup = {
  31   high     = 'iplayer_streaming_h264_flv_high',
  32   standard = 'iplayer_streaming_h264_flv',
  33   low      = 'iplayer_streaming_h264_flv_lo',
  34   vlow     = 'iplayer_streaming_h264_flv_vlo'
  35   -- iplayer_streaming_n95_3g
  36   -- iplayer_streaming_n95_wifi
  37 }
  38
  39 -- Identify the script.
  40 function ident(self)
  41     package.path = self.script_dir .. '/?.lua'
  42     local C      = require 'quvi/const'
  43     local r      = {}
  44     r.domain     = "www.bbc.co.uk"
  45     r.formats    = "default|best"
  46     for k,_ in pairs(fmt_id_lookup) do
  47         r.formats = r.formats .."|".. k
  48     end
  49     r.categories = C.proto_rtmp
  50     local U      = require 'quvi/util'
  51     r.handles    = U.handles(self.page_url, {r.domain}, {"/iplayer/"})
  52     return r
  53 end
  54
  55 -- Parse video URL.
  56 function parse(self)
  57
  58     function needs_new_authString(params)
  59         if not params['authString'] then
  60             return false
  61         end
  62         local found = false
  63         for _,kind in pairs{'limelight', 'akamai', 'level3', 'sis', 'iplayertok'} do
  64             if kind == params['kind'] then
  65                 found = true
  66                 break
  67             end
  68         end
  69         if not found then return false end
  70         -- We don't need to check for the mode, we already know it's what we want
  71         return true
  72     end
  73
  74     function create_uri_for_limelight_level3_iplayertok(params)
  75         params.uri = params.tcurl .. '/' .. params.playpath
  76     end
  77
  78     function process_akamai(params)
  79         params.playpath = params.identifier
  80         params.application = params.application or 'ondemand'
  81         params.application = params.application .. '?_fcs_vhost=' .. params.server .. '&undefined'
  82         params.uri = 'rtmp://' .. params.server .. ':80/' .. params.application
  83         if not params.authString:find("&aifp=") then
  84             params.authString = params.authString .. '&aifp=v001'
  85         end
  86         if not params.authString:find("&slist=") then
  87             params.identifier = params.identifier:gsub('^mp[34]:', '')
  88             params.authString = params.authString .. '&slist=' .. params.identifier
  89         end
  90         params.playpath = params.playpath .. '?' .. params.authString
  91         params.uri = params.uri .. '&' .. params.authString
  92         params.application = params.application .. '&' .. params.authString
  93         params.tcurl = 'rtmp://' .. params.server .. ':80/' .. params.application
  94     end
  95
  96     function process_limelight_level3(params)
  97         params.application = params.application .. '?' .. params.authString
  98         params.tcurl = 'rtmp://' .. params.server .. ':1935/' .. params.application
  99         params.playpath = params.identifier
 100         create_uri_for_limelight_level3_iplayertok(params)
 101     end
 102
 103     function process_iplayertok(params)
 104         params.identifier = params.identifier .. '?' .. params.authString
 105         params.playpath = params.identifier:gsub('^mp[34]:', '')
 106         params.tcurl = 'rtmp://' .. params.server .. ':1935/' .. params.application
 107         create_uri_for_limelight_level3_iplayertok(params)
 108     end
 109
 110     self.host_id = 'bbc'
 111
 112     local _,_,s = self.page_url:find('episode/(.-)/')
 113     local episode_id = s or error('no match: episode id')
 114     self.id = episode_id
 115
 116     local playlist_uri =
 117         'http://www.bbc.co.uk/iplayer/playlist/' .. episode_id
 118     local playlist = quvi.fetch(playlist_uri, {fetch_type = 'playlist'})
 119
 120     local pl_item_p,_,s = playlist:find('<item kind="programme".-identifier="(.-)"')
 121     if not s then
 122         pl_item_p,_,s = playlist:find('<item kind="radioProgramme".-identifier="(.-)"')
 123         -- TODO: Implement radio support
 124         if s then
 125             error('No support for radio yet')
 126         end
 127     end
 128     local media_id = s or error('no match: media id')
 129
 130     local _,_,s = playlist:find('duration="(%d+)"', pl_item_p)
 131     self.duration = tonumber(s) or 0
 132
 133     local _,_,s = playlist:find('<title>(.-)</title>')
 134     self.title = s or error('no match: video title')
 135
 136     local _,_,s = playlist:find('<link rel="holding" href="(.-)"')
 137     self.media_thumbnail_url = s or ""
 138
 139     -- stolen from http://lua-users.org/wiki/MathLibraryTutorial
 140     math.randomseed(os.time()) math.random() math.random() math.random()
 141     local config_uri =
 142         'http://www.bbc.co.uk/mediaselector/4/mtis/stream/' ..
 143         media_id .. "?cb=" .. math.random(10000)
 144
 145     local config = quvi.fetch(config_uri, {fetch_type = 'config'})
 146
 147     available_formats = {}
 148     for fmt_id in config:gmatch("iplayer_streaming_[%w_]+") do
 149         available_formats[fmt_id] = true
 150     end
 151     -- Create the list of acceptable formats, ordered by preference
 152     local r = self.requested_format
 153     local preferred = ((r == 'best') and {'high', 'standard', 'low', 'vlow'})
 154                    or ((r == 'default') and {'standard', 'low', 'vlow', 'high'})
 155                    or {r}
 156
 157     -- Pick the first acceptable format available
 158     local format
 159     for _, cur_format in ipairs(preferred) do
 160         if available_formats[fmt_id_lookup[cur_format]] then
 161             format = cur_format
 162             break
 163         end
 164     end
 165     if not format then error('format not available') end
 166
 167     -- Iterate over <media/>s
 168     local media
 169     for section in config:gmatch('<media .-</media>') do
 170         if section:find('service="' .. fmt_id_lookup[format] .. '"') then
 171             media = section
 172             break
 173         end
 174     end
 175     if not media then error("Couldn't parse the config") end
 176
 177     self.url = {}
 178
 179     -- Initialise with the default values from the media
 180     local mparams = {}
 181     for _,mparam in pairs{'kind', 'service'} do
 182         _,_,mparams[mparam] = media:find(mparam .. '="(.-)"')
 183         -- print ("MEDIA: mparams[" .. mparam .. "] = " .. mparams[mparam])
 184     end
 185
 186     for connection in media:gmatch('<connection .-/>') do
 187         local params, complete_uri = {}, ''
 188
 189         for _,param in pairs{'supplier', 'server', 'application', 'identifier', 'authString', 'kind'} do
 190             _,_,params[param] = connection:find(param .. '="(.-)"')
 191             -- print ("CONNECTION: params[" .. param .. "] = " .. (params[param] or "(null)"))
 192         end
 193
 194         -- Get authstring from more specific mediaselector if
 195         -- this mode is specified - fails sometimes otherwise
 196         if needs_new_authString(params) then
 197             local xml_url
 198             xml_uri =
 199                 'http://www.bbc.co.uk/mediaselector/4/mtis/stream/' ..
 200                 media_id .. '/' .. mparams['service'] .. '/' .. params['kind'] ..
 201                 "?cb=" .. math.random(10000)
 202             xml = quvi.fetch(xml_uri, {fetch_type = 'config'})
 203             local _,_,new_authString = xml:find('authString="(.-)"')
 204             if new_authString then
 205                 params['authString'] = new_authString:gsub('&amp;', '&')
 206             end
 207         else
 208             -- Unescape the authString
 209             if params['authString'] then
 210                 params['authString'] = params['authString']:gsub('&amp;', '&')
 211             end
 212         end
 213
 214         -- in 'application', mp has a value containing one or more entries separated by strings.
 215         -- We only keep the first entry.
 216         if params.application then
 217             params.application = params.application:gsub("&mp=([^,&]+),?.-&", "&mp=%1&")
 218         end
 219
 220         if params.supplier == 'akamai' then
 221             process_akamai(params)
 222         end
 223
 224         if (params.supplier == 'limelight' or params.supplier == 'level3') then
 225             process_limelight_level3(params)
 226         end
 227
 228         params.uri = params.uri or error('Could not create RTMP URL')
 229
 230         complete_uri = params.uri
 231             .. ' app=' .. params.application
 232             .. ' playpath=' .. params.playpath
 233             .. ' swfUrl=http://www.bbc.co.uk/emp/revisions/18269_21576_10player.swf?revision=18269_21576 swfVfy=1'
 234             .. ' tcUrl=' .. params.tcurl
 235             .. ' pageurl=' .. self.page_url
 236
 237         self.url[#(self.url) + 1] = complete_uri
 238     end
 239
 240     return self
 241 end