mp3-parser

A library for parsing headers of mp3 files, including MPEG header frame data and any Xing/Lame tags.

Features

• Runs on Clojure and ClojureScript
• Parse and report existence of an ID3V2 header
• Skip any ID3V2 tag, if it exists
• Parse and report MPEG header frame data
• Parse and report existence of a Xing tag in the header frame
• Parse and report Xing tag data, if it exists
• Parse and report existence of a Lame tag in the header frame
• Parse and report Lame tag data, if it exists
• Calculate the CRC-16 of the Lame tag data, compare it with the stored CRC-16, and report if it is valid or not

Status

Alpha

Dependencies

• Java 8
• Clojure command line tools
• NodeJS (if using ClojureScript)

Tested with Clojure 1.10.1, ClojureScript 1.10.520

Usage

Clojure deps.edn with Git

Add the following to :deps in the deps.edn file for the project:

digital-dj-tools/mp3-parser {:git/url "https://github.com/digital-dj-tools/mp3-parser.git"
                             :sha "515c4838dc0b1eadebe64ec5f0a9ed827cfed54c"}

Clojure deps.edn with Clojars

TODO

Sync API Example

Go to the project directory and start a REPL:

clj

Enter the following code:

(require
 '[mp3-parser.app :as app])

(def mp3-file
  "test-resources/lame-mp3-cbr-stereo-44100khz-192kbps-id3v2.mp3")

(app/parse mp3-file)

The following result should be printed:

{:id3v2-offset 42005
 :mpeg-valid? true
 :mpeg {:mp3-parser.mpeg/bit-rate 192000
        :mp3-parser.mpeg/frame-length 626.0
        :mp3-parser.mpeg/has-padding? false
        :mp3-parser.mpeg/header [-1 -5 -80 100]
        :mp3-parser.mpeg/layer 3
        :mp3-parser.mpeg/num-channels 2
        :mp3-parser.mpeg/num-samples 1152
        :mp3-parser.mpeg/sample-rate 44100
        :mp3-parser.mpeg/version 1}
 :xing-tag? true
 :xing {:mp3-parser.xing/keyword "Info", 
        :mp3-parser.xing/offset 36}
 :lame-tag? true
 :lame {:mp3-parser.lame/crc-valid? true 
        :mp3-parser.lame/encoder "LAME3.99r", 
        :mp3-parser.lame/revision 0}}

Async API Example

TODO

API Docs

TODO

Developers

Running the Tests

clj -Adev:test

clj -Adev:test-cljs

Starting a CIDER-compatible NREPL Server

clj -Adev:nrepl-server

License

Copyright © 2018 Digital DJ Tools

Released under the MIT license.