Class: MPlayer::Screenshoter

Inherits:
Object
  • Object
show all
Defined in:
lib/mplayer_screenshot.rb

Instance Method Summary collapse

Constructor Details

#initialize(file, mplayer_cmd) ⇒ Screenshoter

Returns a new instance of Screenshoter.



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# File 'lib/mplayer_screenshot.rb', line 13

def initialize(file, mplayer_cmd)
  @file = file
  @mplayer_cmd = mplayer_cmd
end

Instance Method Details

#clean ⇒ Object

Delete all png generated files excepted the wanted one which will be moved to where you specified. Usually, there should be only one file, “0000001.png”, but if something goes wrong, many files could be created, eating your freespace with tons of pngs, let’s avoid this.



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# File 'lib/mplayer_screenshot.rb', line 43

def clean
  frames = Dir.glob('[0-9]*.png')
  frames.each do |file|
    File.delete(file) unless file == frames[-1]
  end
  
  File.copy frames[-1], @opts[:filename]
  File.delete frames[-1]
end

#mplayer(opts = {}) ⇒ Object 



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# File 'lib/mplayer_screenshot.rb', line 53

def mplayer(opts={})
  log = ""
  
  IO.popen("#{@mplayer_cmd} #{serialize_arguments(opts)} #{@file}") do |out|
    out.each_line { |line| log << line }
  end
  
  log
end

#normalize_path ⇒ Object 



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# File 'lib/mplayer_screenshot.rb', line 34

def normalize_path
  @opts[:filename] = File.expand_path @opts[:filename]
end

#serialize_arguments(opts = {}) ⇒ Object 



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# File 'lib/mplayer_screenshot.rb', line 63

def serialize_arguments(opts={})
  str = ""
  
  opts.each do |k,v|
    str << "-#{k} #{v} "
  end
  
  str
end

#take(opts = {}) ⇒ Object 



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# File 'lib/mplayer_screenshot.rb', line 18

def take(opts={})
  raise "Missing :at value, aborting." unless opts[:at]
  raise "Missing :filename value, aborting." unless opts[:filename]
  
  @opts = opts.dup
  normalize_path
  Dir.chdir '/tmp' do 
    mplayer :frames  => 1, 
            :vo      => 'png', 
            :nosound => "",
            :ss      => opts[:at]
    clean
  end
  
end