class AudioTrack

# File lib/rtrack.rb, line 14
def self.from_file(infile)
  if not (File.exists? infile)
    fail StandardError, "Couldn't find file from path: #{infile}"
  end
  infile = File.open(infile)
  wavefile = Tempfile.new ['','.wav']
  duration = RTrack::Transcoder.to_wave(infile.path, wavefile.path)
  AudioTrack.new wavefile, duration
end

# File lib/rtrack.rb, line 9
def initialize (wavefile, duration)
  @wavefile = wavefile
  @duration = duration
end

# File lib/rtrack.rb, line 47
def +(other)
  info = RTrack::Transcoder.concat @wavefile.path, other.wavefile.path
  AudioTrack.new info["wavefile"], info["duration"]
end

# File lib/rtrack.rb, line 32
def [](slice_range)
  if not slice_range.class == Range
    fail StandardError, "Invalid slice was given: #{slice_range}"
  end
  
  slice_start, slice_end = slice_range.min, slice_range.max
  new_wavefile = Tempfile.new ['','.wav']
  duration = RTrack::Transcoder.to_slice(@wavefile.path,
    new_wavefile.path,
    slice_start,
    slice_end)
  
  AudioTrack.new new_wavefile, duration
end

# File lib/rtrack.rb, line 52
def export(outpath, format="mp3", bitrate="128k")
  return_code = RTrack::Transcoder.export(@wavefile.path, outpath, format, bitrate)
  return_code
end

# File lib/rtrack.rb, line 28
def path
  @wavefile.path
end

# File lib/rtrack.rb, line 24
def seconds
  @duration / 1000
end