From: Lars Christensen <dsl8950@...>
Date: 2002-07-01T18:51:11+09:00
Subject: Re: mpg123

On Sat, Jun 15, 2002 at 08:35:10AM +0900, Tobias Reif wrote:
> did anyone write a GUI frontend or a scripting API for mpg123?

Sorry for the slow response, I'm just catching up. I wrote this for
mpg321 (which has a better decoder than mpg123, imho):


require 'open3'

class MP3Player
  attr_reader :mode
  attr_reader :mp3info
  attr_reader :current_frame, :frames_remaining, :current_time, :time_remaining

  def initialize
    @mode = :stopped
    @done_callback = nil
    @cmdwrite, cmdread, @err = Open3.popen3("mpg321 -R nil")
    Thread.start {
      cmdread.each_line { |ln|
	case ln.chomp
	when /^@P 0$/
	  @mode = :stopped
	  @current_frame = nil
	  @done_callback.call if @done_callback
	when /^@P 1$/
	  @mode = :paused
	when /^@P 2$/
	  @mode = :playing
	when /^@S (.*)$/
	  @mp3info = $1
	when /^@F\s+(\d+)\s+([-\d]+)\s+([\d\.]+)\s+([-\d\.]+)/
	  @mode = :playing
	  @current_frame = $1.to_i
	  @frames_remaining = $2.to_i
	  @current_time = $3.to_f
	  @time_remaining = $4.to_f
	else
	  $stderr.puts ln
	end
      }
    }
  end

  def on_end_of_file(&block)
    @done_callback = block
  end

  def play(filename)
    @cmdwrite.puts "LOAD #{filename}"
  end

  def seek(frame)
    @cmdwrite.puts "JUMP #{frame}"
  end

  def status
    @mode.to_s + @mp3info.to_s
  end

  def shutdown
    @cmdwrite.puts "QUIT"
  end

end
-- 
Lars Christensen