Jarosław Szmigielski's techblog

My personal adventure with IT

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Music Cataloger

January 19th, 2013

I’ve finally found some time to realize my concept written here. In the meantime I’ve also managed to connect external hard drive to my Raspberry Pi. I have a lot of problems with it and tried lots of approaches but finally it’s working (I will describe it in the next post).

Now my music library is available in Raspberry Pi 🙂 It’s quite a lot of mp3s so I decided to write a quick little script in Python that will fetch basic data about file name, location, size, song duration, bitrate and data from ID3 tags. I’m also computing checksum of file to discover duplicates. All this data is later stored in MySQL database.

At first I prepared a SQL script with table creation:

CREATE TABLE IF NOT EXISTS `music` (
  `id` INT(11) NOT NULL AUTO_INCREMENT,
  `file_name` text COLLATE utf8_unicode_ci NOT NULL,
  `file_format` text COLLATE utf8_unicode_ci NOT NULL,
  `file_location` text COLLATE utf8_unicode_ci NOT NULL,
  `file_checksum` text COLLATE utf8_unicode_ci NOT NULL,
  `file_size` INT(11) NOT NULL,
  `tag_title` text COLLATE utf8_unicode_ci NOT NULL,
  `tag_artist` text COLLATE utf8_unicode_ci NOT NULL,
  `tag_album` text COLLATE utf8_unicode_ci NOT NULL,
  `tag_year` text COLLATE utf8_unicode_ci NOT NULL,
  `tag_comment` text COLLATE utf8_unicode_ci NOT NULL,
  `tag_genre` text COLLATE utf8_unicode_ci NOT NULL,
  `tag_tracknumber` INT(11) NOT NULL,
  `song_length` INT(11) NOT NULL,
  `song_bitrate` INT(11) NOT NULL,
  `date_added` datetime NOT NULL,
  `health` INT(11) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=1;

Force Transmission daemon to make directories accessible for Samba users

October 26th, 2012
Recently I faced a problem that directories created by transmission daemon had insufficient permissions to write in them by Samba users. I needed this feature because I wrote a bot (soon I will post it) that monitors RSS feed of private torrent tracker and downloads .torrent files with my favorite TV series. Then transmission starts downloading it. When it finishes I go there though Samba on my laptop with Windows and I need to download subtitles there. Here comes the problem with lack of permissions for user that I connect though samba.

My transmission daemon runs on user debian-transmission and on group with the same name. I connect though Samba using pi user. So I’ve added user pi to debian-transmission group:

# usermod -a -G debian-transmission pi

I needed to change also transmission settings (usually located in /etc/transmission-daemon/settings.json) and change line with:

"umask": 18,

to line:

"umask": 2,

Umask is usually represented in octal, but json does not support that, so we need to convert it to decimal. We can use simple bash command as quick calculator:

# echo $(( 8#022 ))
18

After modification of settings.json file save it and make command:

# service transmission-daemon reload

 

Now you can make files in directories created in transmission daemon though Samba 🙂

Jarosław Szmigielski

jaroslaw@szmigielski.info

[CONCEPT] Script to catalog music library and discover duplicates

October 17th, 2012

I’ve recently came up with an idea of writing small python crawler that would go through my music library, retrieve information about name, all ID3 tags from my mp3s and CRC32 checksum of them and store them into MySQL database. It would allow me to detect duplicated songs on my disc and maybe more usages in the future.

I haven’t done any research about similar applications but if there are ones, I will write my own anyway 😉

If I would only find time to do this…