DZone Snippets: mp3 code

Reencoding MP3s to lower Bitrate

rootie (Alvin) — Sun, 10 Feb 2008 14:39:07 GMT

http://ubuntuforums.org/showthread.php?t=347176
Batch-reencode MP3s using a terminal tool.

this installs lame (http://lame.sourceforge.net/index.php), an MP3 enconder



sudo apt-get install lame

this reencodes all MP3s in the current folder to a bitrate of 32



for x in [ `ls -1 *.mp3` ]; do lame --preset 32 $x new32-${x}; done

GStreamer Pipeline for ripping MP3s

iansealy (Ian Sealy) — Mon, 31 Dec 2007 11:53:22 GMT

// GStreamer Pipeline for ripping MP3s



audio/x-raw-int,rate=44100,channels=2 ! lame name=enc vbr=4 vbr-quality=2 ! xingmux ! id3v2mux

Convert a video file to an audio file (.mp4 to .mp3)

jrobertson (James Robertson) — Sat, 13 Oct 2007 10:37:27 GMT

Convert an mp4 file to avi, then to mp3 (including mixing the stereo down to mono). This code was executed from the command-line on Ubuntu 7.04.



mencoder video.mp4 -ovc lavc -vf scale=123:100 -oac lavc -o video.avi

ffmpeg -i video.avi -ac 1 audio1.mp3

Flac to mp3

scvalex (Alexandru Scvortov) — Tue, 02 Oct 2007 18:02:03 GMT

Converts all *.flac files in the current dir to mp3.



#!/bin/bash



for file in *.flac

do

	echo Converting $file

	flac123 -q --wav=- "$file" | lame - "$file".mp3

done

Play MP3 files

mstampar (Miroslav Stampar) — Tue, 24 Apr 2007 22:44:44 GMT



public class Player

{

  private string _command;

  private bool isOpen;

 [DllImport("winmm.dll")]

private static extern long mciSendString(string strCommand,StringBuilder strReturn,int iReturnLength, IntPtr hwndCallback);

  

public Player()

 {

   

 }

public void Close()

 {

  _command = "close MediaFile";

  mciSendString(_command, null, 0, IntPtr.Zero);

       isOpen=false;

 }



public void Open(string sFileName)

 {

  _command = "open \"" + sFileName + "\" type mpegvideo alias MediaFile";

  mciSendString(_command, null, 0, IntPtr.Zero);

  isOpen = true;

 }



public void Play(bool loop)

 {

  if(isOpen)

  {

   _command = "play MediaFile";

   if (loop)

    _command += " REPEAT";

    mciSendString(_command, null, 0, IntPtr.Zero);

   }

 }



}

tamilbeat.com mp3 crawler

mbchandar (balachandar) — Wed, 14 Mar 2007 07:53:45 GMT

create a file called links.dat and put the songs link from tamilbeat.com



#!/usr/bin/env ruby

require 'net/http'

require 'socket'

                                                                                                                            

Thread.abort_on_exception = true

threads = []

                                                                                                                            

line = File.open("links.dat")

IO.foreach("links.dat") {|line|

  if %r{http://([^/]+)/([^/]+/+.+)}i =~ line

    domain,path = $1, $2

  end

  web = TCPSocket.new(domain,"http")

  web.print "GET /"+path+" HTTP/1.0\n\n"

  web.print "User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.2) Gecko/20070220 Firefox/2.0.0.2"

  answer = web.gets(nil)

  web.close

                                                                                                                            

  # for mp3

  arr = answer.scan(/http:\/\/www.+mp3/)

                                                                                                                            

  arr.each do |e|

    threads << Thread.new(e){|mp3|

      if %r{http://([^/]+)/([^/]+/+.+)/(.+mp3)}i =~ mp3

        website,song,name = $1, $2, $3

      end

      a=Net::HTTP.new(website,80)

      song_get = "/"+song+"/"+name

      puts "Fetching #{website}#{song_get}"

      resp, data = a.get(song_get,nil)

      puts "Got #{website}#{song_get}: #{resp.message}"

      open(name,'w'){|f| f.write(data)}

    }

  end

}

threads.each {|aThread| aThread.join}

Python id3 tag from containing folder

dannyq (danny) — Tue, 13 Feb 2007 12:55:04 GMT

// Total noob python script for renaming the 'album' tag in an untagged mp3 file. I plug it into podnova (using advanced -> run command) as it downloads my podcasts so that they get sorted correctly when I copy them onto my ipod.

PodNova organizes podcasts by folder. the iPod organizes podcasts by album tag. If you use GtkPod to copy podcasts from PodNova, this can help keep mp3 podcasts categorized properly.



#!/usr/bin/python

import sys



# requires ID3 module, easily googled

from ID3 import *

for arg in sys.argv:

    fullfilename = arg



# This only works for mp3 files, I would love suggestions for mp4 tags

id3info = ID3(fullfilename)



# Print command useful for logging.

print id3info



# Check if album info exists

if not id3info.has_key('ALBUM'):

    print 'appending album tag'

    # truncate to just containing directory:

    folder = fullfilename[1:rfind(fullfilename,'/')]

    # define album based on podcast's directory

    album = (folder[rfind(folder,'/'):]).strip('/')

    id3info.album = album

    if id3info.album == album:

        print 'success!'

else:

    print 'nothing to change'

My handy mp3 "alarm clock" written in Ruby.

bhtek (Boon Hian Tek) — Mon, 12 Feb 2007 21:21:11 GMT

// Simple tool to help wake me up in the morning. Not the cleanest code, but it took no time to write. Ruby rocks!



#!/bin/env ruby

#

# A helper to setup an alarm to slowly and leisurely wake up in the morning.

#

# $Id: mp3wakeup.rb 6 2007-01-31 16:02:57Z btek $

#



if ARGV.length < 1

	puts "Usage: #{$0}  [mp3dir]"

	exit 1

end



#############################

# Configuration parameters. #

#############################



NUM_STEPS = 15

STEP_DURATION = 60 * 1



FINAL_VOLUME = 95

INITIAL_VOLUME = 30

VOLUME_STEP = (FINAL_VOLUME - INITIAL_VOLUME) / NUM_STEPS



MIN_SEC_BEFORE_ALARM = NUM_STEPS * STEP_DURATION



#############################

#############################



time = Regexp.quote ARGV[0]

mp3dir = Regexp.quote(ARGV[1]) if ARGV.length > 1



def get_alarm_time(desired_hour, desired_minute)

  now = Time.new

  

  alarm_time = Time.local(now.year, now.month, now.day, desired_hour, desired_minute, 0, 0)

  

  if alarm_time - now < MIN_SEC_BEFORE_ALARM

    alarm_time = alarm_time + 60*60*24

  end

  

  return alarm_time

end



def run(cmd)

  #puts cmd

  system cmd

end



puts "Waking you up by #{time} with songs from #{mp3dir}."



match = time.match(/(\d+)(:(\d+))?/)

hour = match[1].to_i

minute = if (match.length > 1)

           match[3].to_i 

         else

           0

         end



alarm_time = get_alarm_time(hour, minute)



for i in 0..NUM_STEPS

  alert_time = alarm_time - (STEP_DURATION * i)

  volume = FINAL_VOLUME - (VOLUME_STEP * i)

  

  at_cmd = "at #{alert_time.hour.to_s.rjust(2, '0')}:#{alert_time.min.to_s.rjust(2, '0')}"

  run "echo amixer sset PCM #{volume}% | #{at_cmd}"

  

  if i == NUM_STEPS

    # Start playing after time is confirmed set.

    alert_time = alert_time + (60)

    at_cmd = "at #{alert_time.hour.to_s.rjust(2, '0')}:#{alert_time.min.to_s.rjust(2, '0')}"

    

    if mp3dir != nil

      run "echo audacious #{mp3dir} | #{at_cmd}"

    else

      run "echo audtool playback-play | #{at_cmd}"

    end

  end

end

Java - Example Very Simple Player (JMF)

whitetiger () — Fri, 27 Oct 2006 15:53:37 GMT

// Main Class



package org.jmf.example;



import javax.swing.JDialog;

import javax.swing.JFrame;

import javax.swing.UIManager;

import javax.swing.UnsupportedLookAndFeelException;

import javax.swing.plaf.metal.MetalLookAndFeel;



public class ExampleJMF

{

	public static void main(String[] args)

	{

		JFrame.setDefaultLookAndFeelDecorated(true); 

		JDialog.setDefaultLookAndFeelDecorated(true);

		

		try

		{

			UIManager.setLookAndFeel(new MetalLookAndFeel());

		}

		catch(UnsupportedLookAndFeelException e)

		{

			e.printStackTrace();

		}

		

		new exampleFrame();

	}

}

// Frame Class



package org.jmf.example;



import java.awt.Toolkit;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;



import javax.swing.JFrame;



public class exampleFrame extends JFrame

{

	private static final long serialVersionUID = 1L;

	

	public exampleFrame()

	{

		super("JMF - Example...");

		

		setSize(400, 300);

		setLocation((Toolkit.getDefaultToolkit().getScreenSize().width - getWidth())/2, (Toolkit.getDefaultToolkit().getScreenSize().height - getHeight())/2);

		

		addWindowListener(new WindowAdapter()

		{

			public void windowClosing(WindowEvent evt)

			{

				System.exit(0);

			}

		});

		

		setContentPane(new examplePanel());

		setVisible(true);

	}

}

// Panel Class



package org.jmf.example;



import java.awt.Component;

import java.awt.Graphics;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.IOException;

import java.net.MalformedURLException;

import java.net.URL;



import javax.media.ControllerEvent;

import javax.media.ControllerListener;

import javax.media.Manager;

import javax.media.NoPlayerException;

import javax.media.Player;

import javax.media.RealizeCompleteEvent;

import javax.swing.JPanel;



public class examplePanel extends JPanel implements ActionListener, ControllerListener

{

	private static final long serialVersionUID = 1L;

	

	private Component visualComponent;

	private Player player;

	

	public examplePanel()

	{

		try

		{

			player = Manager.createPlayer(new URL("file:///tmp/a.mpg"));

			player.addControllerListener(this);

			

			player.start();

		}

		catch(NoPlayerException e)

		{

			e.printStackTrace();

		}

		catch(MalformedURLException e)

		{

			e.printStackTrace();

		}

		catch(IOException e)

		{

			e.printStackTrace();

		}

	}

	

	public void paintComponent(Graphics g)

	{

		super.paintComponent(g);

	}



	public void actionPerformed(ActionEvent e)

	{



	}



	public void controllerUpdate(ControllerEvent c)

	{

		if(player == null)

			return;

		

		if(c instanceof RealizeCompleteEvent)

		{

			if((visualComponent = player.getVisualComponent()) != null)

				add(visualComponent);

		}

	}

}

Playlist generator

lordrich () — Tue, 11 Apr 2006 19:53:18 GMT

Bash script to generate a playlist with all your mp3s and oggs in.



rm ~/Desktop/playlist.m3u

find ~/music/ -iname "*.mp3" -print >> ~/Desktop/playlist.m3u

find ~/music/ -iname "*.ogg" -print >> ~/Desktop/playlist.m3u