share/lua/website/ted.lua

   1
   2 -- quvi
   3 -- Copyright (C) 2011  Toni Gundogdu <legatvs@gmail.com>
   4 -- Copyright (C) 2011  Bastien Nocera <hadess@hadess.net>
   5 --
   6 -- This file is part of quvi <http://quvi.sourceforge.net/>.
   7 --
   8 -- This library is free software; you can redistribute it and/or
   9 -- modify it under the terms of the GNU Lesser General Public
  10 -- License as published by the Free Software Foundation; either
  11 -- version 2.1 of the License, or (at your option) any later version.
  12 --
  13 -- This library is distributed in the hope that it will be useful,
  14 -- but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 -- Lesser General Public License for more details.
  17 --
  18 -- You should have received a copy of the GNU Lesser General Public
  19 -- License along with this library; if not, write to the Free Software
  20 -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21 -- 02110-1301  USA
  22 --
  23
  24 local Ted = {} -- Utility functions unique to this script
  25
  26 -- Identify the script.
  27 function ident(self)
  28     package.path = self.script_dir .. '/?.lua'
  29     local C      = require 'quvi/const'
  30     local r      = {}
  31     r.domain     = "ted.com"
  32     r.formats    = "default|best"
  33     r.categories = C.proto_http
  34     local U      = require 'quvi/util'
  35     r.handles    = U.handles(self.page_url, {r.domain}, {"/talks/.+$"})
  36     return r
  37 end
  38
  39 -- Query available formats.
  40 function query_formats(self)
  41     local page    = quvi.fetch(self.page_url)
  42     local formats = Ted.iter_formats(page)
  43
  44     local t = {}
  45     for _,v in pairs(formats) do
  46         table.insert(t, Ted.to_s(v))
  47     end
  48
  49     table.sort(t)
  50     self.formats = table.concat(t, "|")
  51
  52     return self
  53 end
  54
  55 -- Parse video URL.
  56 function parse(self)
  57     self.host_id = "ted"
  58     local page   = quvi.fetch(self.page_url)
  59
  60     self.id      = page:match('ti:"(%d+)"')
  61                     or error("no match: media id")
  62
  63     self.title   = page:match('<title>(.-)%s+|')
  64                     or error("no match: media title")
  65
  66     self.thumbnail_url = page:match('&amp;su=(.-)&amp;') or ''
  67
  68     local formats = Ted.iter_formats(page)
  69     local U       = require 'quvi/util'
  70     self.url      = {U.choose_format(self, formats,
  71                                      Ted.choose_best,
  72                                      Ted.choose_default,
  73                                      Ted.to_s).url
  74                         or error("no match: media url")}
  75
  76     return self
  77 end
  78
  79 --
  80 -- Utility functions
  81 --
  82
  83 function Ted.iter_formats(page)
  84     local pp = 'http://download.ted.com'
  85     local p  = 'href="' ..pp.. '(.-)"'
  86     local t  = {}
  87     for u in page:gfind(p) do
  88         local c = u:match('%.(%w+)$') or error('no match: container')
  89         local q = u:match('%-(%w+)%.%w+$') -- nil is acceptable here
  90         u = pp .. u
  91         if not Ted.find_duplicate(t,u) then
  92             table.insert(t, {url=u, container=c, quality=q})
  93 --            print(u,c,q)
  94         end
  95     end
  96     return t
  97 end
  98
  99 function Ted.find_duplicate(t,u)
 100     for _,v in pairs(t) do
 101         if v.url == u then return true end
 102     end
 103     return false
 104 end
 105
 106 function Ted.choose_best(formats) -- Last 'mp4' is the 'best'
 107     local r = Ted.choose_default(formats)
 108     local p = '(%d+)p'
 109     for _,v in pairs(formats) do
 110         if v.container:match('mp4') then
 111             if v.quality then
 112                 local a = v.quality:match(p)
 113                 local b = (r.quality) and r.quality:match(p) or 0
 114                 if a and tonumber(a) > tonumber(b) then
 115                     r = v
 116                 end
 117             else
 118                 r = v
 119             end
 120         end
 121     end
 122     return r
 123 end
 124
 125 function Ted.choose_default(formats) -- First 'mp4' is the 'default'
 126     local r -- Return this if mp4 is not found for some reason
 127     for _,v in pairs(formats) do
 128         if v.container:match('mp4') then
 129             return v
 130         end
 131         r = v
 132     end
 133     return r
 134 end
 135
 136 function Ted.to_s(t)
 137     return (t.quality)
 138         and string.format("%s_%s", t.container, t.quality)
 139         or  string.format("%s", t.container)
 140 end
 141
 142 -- vim: set ts=4 sw=4 tw=72 expandtab: