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#!/usr/bin/env ruby -rubygems |
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# |
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# Author: Riyad Preukschas <riyad@informatik.uni-bremen.de> |
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# License: Mozilla Public License 2.0 |
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# |
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# Transcode any file VLC can play to mp3. |
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require 'optparse' |
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require 'mkmf' |
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require 'shellwords' |
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# |
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# helpers |
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# |
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def puts_error(message) |
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puts "Error: #{message}" |
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end |
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def puts_warning(message) |
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puts "Warning: #{message}" |
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end |
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# |
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# parse options |
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# |
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options = { |
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:bit_rate => 192, |
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:sampling_rate => 44100, |
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} |
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begin |
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OptionParser.new do |opts| |
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opts.banner = "Usage: convert2mp3 [options] FILE [<FILE ...>]" |
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opts.separator "" |
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opts.separator "Conversion Options:" |
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opts.on("-f", "--[no-]force", "Overwrite mp3 file if it exists already") do |f| |
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options[:force_overwrite] = f |
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end |
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opts.on("-o", "--output-directoy [DIRECTORY]", "Save converted files to this directory") do |out_dir| |
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unless File.directory?(out_dir) |
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puts_error %Q(Wrong output directory. "#{out_dir}" is not a directory.) |
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exit 1 |
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end |
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options[:output_dir] = out_dir |
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end |
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opts.separator "" |
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opts.separator "mp3 Options:" |
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opts.on("-b", "--bit-rate [RATE]", Integer, "Bit rate in kbit/s (default: #{options[:bit_rate]})") do |b| |
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options[:bit_rate] = b |
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end |
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opts.on("-s", "--sampling-rate [RATE]", Integer, "Sampling rate in Hz (default: #{options[:sampling_rate]})") do |s| |
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options[:sampling_rate] = s |
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end |
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opts.separator "" |
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opts.separator "General Options:" |
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opts.on_tail("-h", "--help", "Show this message") do |
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puts opts |
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exit 0 |
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end |
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opts.on_tail("-v", "--[no-]verbose", "Be more verbose") do |v| |
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options[:verbose] = v |
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end |
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end.parse! |
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rescue OptionParser::InvalidOption => e |
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puts_error e.message |
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exit 1 |
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end |
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# |
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# gather source files |
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# |
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if ARGV.empty? |
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puts_error "No files given." |
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exit 1 |
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end |
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source_files = [] |
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while !ARGV.empty? |
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source_path = ARGV.shift |
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unless File.exists?(source_path) |
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puts_warning %Q(Skipping "#{source_path}". It doesn't exist.) |
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next |
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end |
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unless File.file?(source_path) |
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puts_warning %Q(Skipping "#{source_path}". It's not a file.) |
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next |
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end |
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source_files << source_path |
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end |
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# |
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# VLC command line options |
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# |
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# using find_executable() will create a mkmf.log file :( |
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vlc_paths = [ |
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'vlc', |
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'/Applications/VLC.app/Contents/MacOS/VLC', |
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File.expand_path('~/Applications/VLC.app/Contents/MacOS/VLC'), |
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] |
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VLC = vlc_paths.find { |path| find_executable0(path) } |
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INTERFACE = '-I dummy' |
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PLAYBACK = '--no-loop --no-repeat --play-and-exit' |
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TRANSCODING = '--sout="#transcode{vcodec=dummy,acodec=mp3,ab=BIT_RATE,channels=2,samplerate=SAMPLING_RATE}:standard{access=file,mux=raw,dst=\'DESTINATION\'}"'. |
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gsub('BIT_RATE', options[:bit_rate].to_s). |
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gsub('SAMPLING_RATE', options[:sampling_rate].to_s) |
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VERBOSITY = options[:verbose] ? '' : '-q 2>/dev/null 1>/dev/null' |
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if VLC.nil? |
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puts_error "Couldn't find VLC." |
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exit 1 |
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end |
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source_files.each do |source_file| |
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source_dir = File.dirname(source_file) |
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output_dir = options[:output_dir] || source_dir |
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output_file = File.join(output_dir, "#{File.basename(source_file, ".*")}.mp3") |
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if File.exist?(output_file) |
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if options[:force_overwrite] |
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puts_warning %Q(Output file exists. "#{output_file}" will be overwritten.) if options[:verbose] |
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else |
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puts_warning %Q(Output file exists already. Skipping "#{output_file}".) |
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next |
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end |
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end |
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puts %Q(Converting "#{source_file}") |
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unless system("#{VLC} #{PLAYBACK} #{INTERFACE} #{TRANSCODING.gsub('DESTINATION', output_file.gsub(/'/, ""))} #{source_file.shellescape} #{VERBOSITY}") |
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puts_error "Conversion failed. Try using the -v option for more detailed output." |
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end |
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puts if options[:verbose] |
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end |
