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| def read_m3u8(m3u8) | |
| File.open(m3u8, 'r') do |file| | |
| keyfile = nil | |
| iv = 0 | |
| file.each_line do |line| | |
| line.chomp! | |
| if line =~ /^#EXT-X-KEY:METHOD=AES-128,URI="(.*?)"(,IV=0x(.*))?/ | |
| keyfile = $1 | |
| if $2 | |
| iv = $3 | |
| iv_gen = :random | |
| else | |
| iv_gen = :sequence | |
| end | |
| elsif not line =~ /^#/ | |
| in_file = File.join(File.dirname(m3u8), line) | |
| ext = File.extname(in_file) | |
| out_file = File.join(File.dirname(in_file), File.basename(in_file, ext) + '.clear' + ext) | |
| decrypt(in_file, keyfile, iv, out_file) | |
| if iv_gen == :sequence | |
| iv += 1 | |
| end | |
| end | |
| end | |
| end | |
| end | |
| def decrypt(in_file, keyfile, iv, out_file) | |
| key = load_key(keyfile) | |
| iv_hex = sprintf('%032x', iv) | |
| %x{openssl aes-128-cbc -d -K #{key} -iv #{iv_hex} -nosalt -in #{in_file} -out #{out_file}} | |
| end | |
| def load_key(keyfile) | |
| File.open(keyfile, 'rb') do |file| | |
| file.read.unpack('H*')[0] | |
| end | |
| end | |
| read_m3u8(ARGV[0]) |
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