2 -- Copyright (C) 2010-2012 Toni Gundogdu <legatvs@gmail.com>
4 -- This file is part of libquvi-scripts <http://quvi.sourceforge.net/>.
6 -- This library is free software; you can redistribute it and/or
7 -- modify it under the terms of the GNU Lesser General Public
8 -- License as published by the Free Software Foundation; either
9 -- version 2.1 of the License, or (at your option) any later version.
11 -- This library is distributed in the hope that it will be useful,
12 -- but WITHOUT ANY WARRANTY; without even the implied warranty of
13 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 -- Lesser General Public License for more details.
16 -- You should have received a copy of the GNU Lesser General Public
17 -- License along with this library; if not, write to the Free Software
18 -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
22 local YouTube
= {} -- Utility functions unique to this script
24 -- <http://en.wikipedia.org/wiki/YouTube#Quality_and_codecs>
26 -- Identify the script.
28 local Y
= require
'quvi/youtube'
29 local u
= Y
.normalize(qargs
.input_url
)
31 domains
= table.concat({'youtube.com'}, ','),
32 can_parse_url
= YouTube
.can_parse_url(u
)
36 -- Parse media properties.
38 local Y
= require
'quvi/youtube'
39 return YouTube
.parse_properties(qargs
, Y
)
46 function YouTube
.can_parse_url(url
)
47 local U
= require
'socket.url'
48 local t
= U
.parse(url
)
49 if t
and t
.scheme
and t
.scheme
:lower():match('^https?$')
50 and t
.host
and t
.host
:lower():match('youtube%.com$')
51 and t
.query
and t
.query
:lower():match('^v=[%w-_]+')
52 and t
.path
and t
.path
:lower():match('^/watch')
60 -- Parses the video info from the server.
61 function YouTube
.parse_properties(qargs
, Y
)
62 local c
, U
= YouTube
.get_data(qargs
, Y
)
64 qargs
.duration_ms
= (c
['length_seconds'] or 0)*1000 -- to ms
65 qargs
.thumb_url
= U
.unescape(c
['thumbnail_url'] or '')
66 qargs
.title
= U
.unescape(c
['title'] or '')
67 qargs
.streams
= YouTube
.iter_streams(c
, U
)
68 YouTube
.append_begin_param(qargs
)
73 -- Queries the video data from the server.
74 function YouTube
.get_data(qargs
, Y
)
75 local u
= Y
.normalize(qargs
.input_url
)
77 qargs
.id
= u
:match('v=([%w-_]+)')
78 or error('no match: media ID')
80 local U
= require
'socket.url'
82 local s
= u
.scheme
or error('no match: scheme')
84 local s_fmt
= '%s://www.youtube.com/get_video_info?&video_id=%s'
85 .. '&el=detailpage&ps=default&eurl=&gl=US&hl=en'
86 local u
= string.format(s_fmt
, s
, qargs
.id
)
88 local C
= require
'quvi/const'
89 local U
= require
'quvi/util'
91 local o
= { [C
.qfo_type
] = C
.qft_config
}
92 local c
= U
.decode(quvi
.fetch(u
, o
))
95 local reason
= U
.unescape(c
['reason'])
96 local code
= c
['errorcode']
97 error(string.format("%s (code=%s)", reason
, code
))
103 -- Appends the &begin parameter to the media stream URL.
104 function YouTube
.append_begin_param(qargs
)
105 local m
,s
= qargs
.input_url
:match('t=(%d?%d?m?)(%d%d)s')
106 m
= tonumber(((m
or ''):gsub('%a',''))) or 0
107 s
= tonumber(((s
or ''):gsub('%a',''))) or 0
108 local ms
= (m
*60000) + (s
*1000)
110 for i
,v
in ipairs(qargs
.streams
) do
111 local url
= qargs
.streams
[i
].url
112 qargs
.streams
[i
].url
= url
.."&begin=".. ms
114 qargs
.start_time_ms
= ms
118 -- Iterates the available streams.
119 function YouTube
.iter_streams(config
, U
)
121 -- Stream map. Holds many of the essential properties,
122 -- e.g. the media stream URL.
124 local stream_map
= U
.unescape(config
['url_encoded_fmt_stream_map']
125 or error('no match: url_encoded_fmt_stream_map'))
129 for d
in stream_map
:gmatch('([^,]*),') do
130 local d
= U
.decode(d
)
132 local ct
= U
.unescape(d
['type'])
133 local v_enc
,a_enc
= ct
:match('codecs="([%w.]+),%s+([%w.]+)"')
134 local itag
= d
['itag']
135 local cnt
= (ct
:match('/([%w-]+)')):gsub('x%-', '')
137 url
= U
.unescape(d
['url']) -- d['sig'] ? "&signature=val" : ""
138 .. (d
['sig'] and ('&signature='..d
['sig']) or ''),
139 quality
= d
['quality'],
148 -- Format list. Combined with the above properties. This list is used
149 -- for collecting the video resolution.
151 local fmtl
= U
.unescape(config
['fmt_list'] or error('no match: fmt_list'))
152 local S
= require
'quvi/stream'
155 for itag
,w
,h
in fmtl
:gmatch('(%d+)/(%d+)x(%d+)') do
156 local smri
= smr
[itag
]
157 local t
= S
.stream_new(smri
.url
)
159 t
.video
.encoding
= smri
.v_enc
or ''
160 t
.audio
.encoding
= smri
.a_enc
or ''
161 t
.container
= smri
.container
or ''
162 t
.video
.height
= tonumber(h
)
163 t
.video
.width
= tonumber(w
)
165 -- Do this after we have the video resolution, as the to_id
166 -- function uses the height property.
167 t
.id
= YouTube
.to_id(t
, itag
, smri
)
173 YouTube
.ch_best(S
, r
) -- Pick one stream as the 'best' quality.
179 -- Picks the stream with the highest video height property
180 -- as the best in quality.
181 function YouTube
.ch_best(S
, t
)
182 local r
= t
[1] -- Make the first one the 'best' by default.
184 for _
,v
in pairs(t
) do
185 if v
.video
.height
> r
.video
.height
then
186 r
= S
.swap_best(r
, v
)
191 -- Return an ID for a stream.
192 function YouTube
.to_id(t
, itag
, smri
)
193 return string.format("%s_%s_i%02d_%sp",
194 smri
.quality
, t
.container
, itag
, t
.video
.height
)
197 -- vim: set ts=2 sw=2 tw=72 expandtab: