Class: Scissor::Chunk

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

Defined Under Namespace

Classes: CommandFailed, EmptyFragment, Error, FileExists, OutOfDuration

Class Attribute Summary collapse

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(filename = nil) ⇒ Chunk

Returns a new instance of Chunk.



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# File 'lib/scissor/chunk.rb', line 23

def initialize(filename = nil)
  @fragments = []

  if filename
    @fragments << Fragment.new(
      filename,
      0,
      SoundFile.new(filename).length)
  end
end

Class Attribute Details

.logger ⇒ Object

Returns the value of attribute logger.



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# File 'lib/scissor/chunk.rb', line 12

def logger
  @logger
end

Instance Attribute Details

#fragments ⇒ Object (readonly)

Returns the value of attribute fragments.



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# File 'lib/scissor/chunk.rb', line 21

def fragments
  @fragments
end

Instance Method Details

#+(other) ⇒ Object 



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# File 'lib/scissor/chunk.rb', line 85

def +(other)
  new_instance = Scissor()
  new_instance.add_fragments(@fragments + other.fragments)
  new_instance
end

#>>(filename) ⇒ Object 



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# File 'lib/scissor/chunk.rb', line 246

def >>(filename)
  to_file(filename, :overwrite => true)
end

#add_fragment(fragment) ⇒ Object 



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# File 'lib/scissor/chunk.rb', line 34

def add_fragment(fragment)
  @fragments << fragment
end

#add_fragments(fragments) ⇒ Object 



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# File 'lib/scissor/chunk.rb', line 38

def add_fragments(fragments)
  fragments.each do |fragment|
    add_fragment(fragment)
  end
end

#concat(other) ⇒ Object Also known as: << 



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# File 'lib/scissor/chunk.rb', line 77

def concat(other)
  add_fragments(other.fragments)

  self
end

#duration ⇒ Object 



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# File 'lib/scissor/chunk.rb', line 44

def duration
  @fragments.inject(0) do |memo, fragment|
    memo += fragment.duration
  end
end

#fill(filled_duration) ⇒ Object 



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# File 'lib/scissor/chunk.rb', line 116

def fill(filled_duration)
  if @fragments.empty?
    raise EmptyFragment
  end

  remain = filled_duration
  new_instance = self.class.new

  while !remain.zero? && filled_duration > new_instance.duration
    if remain < duration
      added = slice(0, remain)
    else
      added = self
    end

    new_instance += added
    remain -= added.duration
  end


  new_instance
end

#logger ⇒ Object 



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# File 'lib/scissor/chunk.rb', line 270

def logger
  self.class.logger
end

#loop(count) ⇒ Object Also known as: * 



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# File 'lib/scissor/chunk.rb', line 91

def loop(count)
  orig_fragments = @fragments.clone

  (count - 1).times do
    add_fragments(orig_fragments)
  end

  self
end

#replace(start, length, replaced) ⇒ Object 



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# File 'lib/scissor/chunk.rb', line 139

def replace(start, length, replaced)
  new_instance = self.class.new
  offset = start + length

  if offset > duration
    raise OutOfDuration
  end

  if start > 0
    new_instance += slice(0, start)
  end

  new_instance += replaced
  new_instance += slice(offset, duration - offset)

  new_instance
end

#reverse ⇒ Object 



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# File 'lib/scissor/chunk.rb', line 157

def reverse
  new_instance = self.class.new

  @fragments.reverse.each do |fragment|
    new_instance.add_fragment(Fragment.new(
        fragment.filename,
        fragment.start,
        fragment.duration,
        !fragment.reversed?))
  end

  new_instance
end

#run_command(cmd) ⇒ Object 



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# File 'lib/scissor/chunk.rb', line 254

def run_command(cmd)
  logger.debug("run_command: #{cmd}")

  result = ''
  status = Open4.popen4(cmd) do |pid, stdin, stdout, stderr|
    logger.debug(stderr.read)
    result = stdout.read
  end

  if status.exitstatus != 0
    raise CommandFailed.new(cmd)
  end

  return result
end

#slice(start, length) ⇒ Object Also known as: [] 



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# File 'lib/scissor/chunk.rb', line 50

def slice(start, length)
  if start + length > duration
    length = duration - start
  end

  new_instance = self.class.new
  remaining_start = start.to_f
  remaining_length = length.to_f

  @fragments.each do |fragment|
    new_fragment, remaining_start, remaining_length =
      fragment.create(remaining_start, remaining_length)

    if new_fragment
      new_instance.add_fragment(new_fragment)
    end

    if remaining_length == 0
      break
    end
  end

  new_instance
end

#split(count) ⇒ Object Also known as: / 



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# File 'lib/scissor/chunk.rb', line 103

def split(count)
  splitted_duration = duration / count.to_f
  results = []

  count.times do |i|
    results << slice(i * splitted_duration, splitted_duration)
  end

  results
end

#to_file(filename, options = {}) ⇒ Object Also known as: > 



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# File 'lib/scissor/chunk.rb', line 171

def to_file(filename, options = {})
  filename = Pathname.new(filename)

  if @fragments.empty?
    raise EmptyFragment
  end

  which('ecasound')
  which('ffmpeg')

  options = {
    :overwrite => false
  }.merge(options)

  filename = Pathname.new(filename)

  if filename.exist?
    if options[:overwrite]
      filename.unlink
    else
      raise FileExists
    end
  end

  position = 0.0
  tmpdir = Pathname.new('/tmp/scissor-' + $$.to_s)
  tmpdir.mkpath
  tmpfile = tmpdir + 'tmp.wav'
  cmd = %w/ecasound/

  begin
    @fragments.each_with_index do |fragment, index|
      fragment_filename = fragment.filename
      fragment_duration = fragment.duration

      if !index.zero? && (index % 80).zero?
        run_command(cmd.join(' '))
        cmd = %w/ecasound/
      end

      fragment_tmpfile =
        fragment_filename.extname.downcase == '.wav' ? fragment_filename :
        tmpdir + (Digest::MD5.hexdigest(fragment_filename) + '.wav')

      unless fragment_tmpfile.exist?
        run_command("ffmpeg -i \"#{fragment_filename}\" \"#{fragment_tmpfile}\"")
      end

      cmd <<
        "-a:#{index} " +
        "-i:" +
        (fragment.reversed? ? 'reverse,' : '') +
        "select,#{fragment.start},#{fragment_duration},\"#{fragment_tmpfile}\" " +
        "-o:#{tmpfile} " +
        "-y:#{position}"

      position += fragment_duration
    end

    run_command(cmd.join(' '))

    if filename.extname == '.wav'
      File.rename(tmpfile, filename)
    else
      run_command("ffmpeg -i \"#{tmpfile}\" \"#{filename}\"")
    end
  ensure
    tmpdir.rmtree
  end

  self.class.new(filename)
end

#which(command) ⇒ Object 



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# File 'lib/scissor/chunk.rb', line 250

def which(command)
  run_command("which #{command}")
end