factor/extra/youtube/youtube.factor

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! Copyright (C) 2013 John Benediktsson
! See http://factorcode.org/license.txt for BSD license
USING: assocs http.client kernel make math.order sequences
splitting urls urls.encoding ;
IN: youtube
TUPLE: encoding extension resolution video-codec profile
video-bitrate audio-codec audio-bitrate ;
CONSTANT: encodings H{
! Flash Video
{ 5 T{ encoding f "flv" "240p" "Sorenson H.263" f "0.25" "MP3" 64 } }
{ 6 T{ encoding f "flv" "270p" "Sorenson H.263" f "0.8" "MP3" 64 } }
{ 34 T{ encoding f "flv" "360p" "H.264" "Main" "0.5" "AAC" 128 } }
{ 35 T{ encoding f "flv" "480p" "H.264" "Main" "0.8-1" "AAC" 128 } }
! 3GP
{ 36 T{ encoding f "3gp" "240p" "MPEG-4 Visual" "Simple" "0.17" "AAC" 38 } }
{ 13 T{ encoding f "3gp" f "MPEG-4 Visual" f "0.5" "AAC" f } }
{ 17 T{ encoding f "3gp" "144p" "MPEG-4 Visual" "Simple" "0.05" "AAC" 24 } }
! MPEG-4
{ 18 T{ encoding f "mp4" "360p" "H.264" "Baseline" "0.5" "AAC" 96 } }
{ 22 T{ encoding f "mp4" "720p" "H.264" "High" "2-2.9" "AAC" 192 } }
{ 37 T{ encoding f "mp4" "1080p" "H.264" "High" "3-4.3" "AAC" 192 } }
{ 38 T{ encoding f "mp4" "3072p" "H.264" "High" "3.5-5" "AAC" 192 } }
{ 82 T{ encoding f "mp4" "360p" "H.264" "3D" "0.5" "AAC" 96 } }
{ 83 T{ encoding f "mp4" "240p" "H.264" "3D" "0.5" "AAC" 96 } }
{ 84 T{ encoding f "mp4" "720p" "H.264" "3D" "2-2.9" "AAC" 152 } }
{ 85 T{ encoding f "mp4" "520p" "H.264" "3D" "2-2.9" "AAC" 152 } }
! WebM
{ 43 T{ encoding f "webm" "360p" "VP8" f "0.5" "Vorbis" 128 } }
{ 44 T{ encoding f "webm" "480p" "VP8" f "1" "Vorbis" 128 } }
{ 45 T{ encoding f "webm" "720p" "VP8" f "2" "Vorbis" 192 } }
{ 46 T{ encoding f "webm" "1080p" "VP8" f f "Vorbis" 192 } }
{ 100 T{ encoding f "webm" "360p" "VP8" "3D" f "Vorbis" 128 } }
{ 101 T{ encoding f "webm" "360p" "VP8" "3D" f "Vorbis" 192 } }
{ 102 T{ encoding f "webm" "720p" "VP8" "3D" f "Vorbis" 192 } }
}
CONSTANT: video-info-url URL" http://www.youtube.com/get_video_info"
: get-video-info ( video-id -- video-info )
video-info-url clone
3 "asv" set-query-param
"en_US" "hl" set-query-param
swap "video_id" set-query-param
http-get nip query>assoc ;
: video-formats ( video-info -- video-formats )
"url_encoded_fmt_stream_map" of "," split
[ query>assoc ] map ;
: video-download-url ( video-format -- url )
[ "url" of ] [ "sig" of ] bi "&signature=" glue ;
: sanitize ( title -- title' )
[ 0 31 between? ] reject
[ "\"#$%'*,./:;<>?^|~\\" member? ] reject
200 short head ;
: downloadable? ( video-info -- ? )
"use_cipher_signature" of "False" = ;
: download-video ( video-id -- )
get-video-info [
downloadable? [ "Video is encrypted." throw ] unless
] [
video-formats [ "type" of "video/mp4" head? ] find nip
video-download-url
] [
"title" of sanitize ".mp4" append download-to
] tri ;