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Python CD-DA ripper preferring accuracy over speed

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Whipper

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Whipper is a Python 2.7 CD-DA ripper based on the morituri project (CDDA ripper for *nix systems aiming for accuracy over speed). It enhances morituri which development seems to have halted merging old ignored pull requests, improving it with bugfixes and new features.

Whipper is currently developed and tested only on Linux distributions but may work fine on other *nix OSes too.

In order to track whipper's latest changes it's advised to check its commit history (README and CHANGELOG files may not be comprehensive).

Table of content

Rationale

For a detailed description, see morituri's wiki page: The Art of the Rip.

Features

  • Detects correct read offset (in samples)
  • Detects whether ripped media is a CD-R
  • Has ability to defeat cache of drives
  • Performs Test & Copy rips
  • Verifies rip accuracy using the AccurateRip database
  • Uses MusicBrainz for metadata lookup
  • Supports reading the pre-emphasis flag embedded into some CDs (and correctly tags the resulting rip). Currently whipper only reports the pre-emphasis flag value stored in the TOC.
  • Detects and rips non digitally silent Hidden Track One Audio (HTOA)
  • Provides batch ripping capabilities
  • Provides templates for file and directory naming
  • Supports lossless encoding of ripped audio tracks (FLAC)
  • Allows extensibility through external logger plugins

Changelog

See CHANGELOG.md.

For detailed information, please check the commit history.

Installation

Whipper still isn't available as an official package in every Linux distributions so, in order to use it, it may be necessary to build it from its source code.

Docker

You can easily install whipper without needing to care about the required dependencies by making use of the automatically built images hosted on Docker Hub:

docker pull whipperteam/whipper

Alternatively, in case you prefer building Docker images locally, just issue the following command (it relies on the Dockerfile included in whipper's repository):

docker build -t whipperteam/whipper

It's recommended to create an alias for a convenient usage:

alias whipper="docker run -ti --rm --device=/dev/cdrom \
    -v ~/.config/whipper:/home/worker/.config/whipper \
    -v ${PWD}/output:/output \
    whipperteam/whipper"

You should put this e.g. into your .bash_aliases. Also keep in mind to substitute the path definitions to something that fits to your needs (e.g. replace … -v ${PWD}/output:/output … with … -v ${HOME}/ripped:/output \ …).

Make sure you create the configuration directory:

mkdir -p ~/.config/whipper ${PWD}/output

Finally you can test the correct installation:

whipper -v
whipper drive list

Package

This is a noncomprehensive summary which shows whipper's packaging status (unofficial repositories are probably not included):

Packaging status

In case you decide to install whipper using an unofficial repository just keep in mind it is your responsibility to verify that the provided content is safe to use.

Building

If you are building from a source tarball or checkout, you can choose to use whipper installed or uninstalled but first install all the required dependencies.

Required dependencies

Whipper relies on the following packages in order to run correctly and provide all the supported features:

  • cd-paranoia, for the actual ripping
    • To avoid bugs it's advised to use cd-paranoia versions ≥ 10.2+0.94+2-2
    • The package named libcdio-utils, available on Debian and Ubuntu, is affected by a bug: it doesn't include the cd-paranoia binary (needed by whipper). For more details see: #888053 (Debian), #889803 (Debian) and #1750264 (Ubuntu).
  • cdrdao, for session, TOC, pre-gap, and ISRC extraction
  • GObject Introspection, to provide GLib-2.0 methods used by task.py
  • PyGObject, required by task.py
  • python-musicbrainzngs, for metadata lookup
  • python-mutagen, for tagging support
  • python-setuptools, for installation, plugins support
  • python-requests, for retrieving AccurateRip database entries
  • pycdio, for drive identification (required for drive offset and caching behavior to be stored in the configuration file).
    • To avoid bugs it's advised to use pycdio 0.20 or 0.21 with libcdio ≥ 0.90 ≤ 0.94 or pycdio 2.0.0 with libcdio 2.0.0. All other combinations won't probably work.
  • libsndfile, for reading wav files
  • flac, for reading flac files
  • sox, for track peak detection

Some dependencies aren't available in the PyPI. They can be probably installed using your distribution's package manager:

PyPI installable dependencies are listed in the requirements.txt file and can be installed issuing the following command:

pip install -r requirements.txt

Fetching the source code

Change to a directory where you want to put whipper source code (for example, $HOME/dev/ext or $HOME/prefix/src)

git clone https://github.com/whipper-team/whipper.git
cd whipper

Building the bundled dependencies

Whipper uses and packages a slightly different version of the accuraterip-checksum tool:

You can edit the install path in config.mk

cd src
make
sudo make install
cd ..

Finalizing the build

Install whipper: python2 setup.py install

Note that, depending on the chosen installation path, this command may require elevated rights.

Usage

Whipper currently only has a command-line interface called whipper which is self-documenting: whipper -h gives you the basic instructions.

Whipper implements a tree of commands: for example, the top-level whipper command has a number of sub-commands.

Positioning of arguments is important:

whipper cd -d (device) rip

is correct, while

whipper cd rip -d (device)

is not, because the -d argument applies to the cd command.

Getting started

The simplest way to get started making accurate rips is:

  1. Pick a relatively popular CD that has a good chance of being in the AccurateRip database

  2. Analyze the drive's caching behavior

    whipper drive analyze

  3. Find the drive's offset.

    Consult the AccurateRip's CD Drive Offset database for your drive. Drive information can be retrieved with whipper drive list.

    whipper offset find -o insert-numeric-value-here

    If you omit the -o argument, whipper will try a long, popularity-sorted list of drive offsets.

    If you can not confirm your drive offset value but wish to set a default regardless, set read_offset = insert-numeric-value-here in whipper.conf.

    Offsets confirmed with whipper offset find are automatically written to the configuration file.

    If specifying the offset manually, please note that: if positive it must be written as a number without sign (ex: +102 -> 102), if negative it must include the sign too (ex: -102 -> -102).

  4. Rip the disc by running

    whipper cd rip

Configuration file documentation

The configuration file is stored in $XDG_CONFIG_HOME/whipper/whipper.conf, or $HOME/.config/whipper/whipper.conf if $XDG_CONFIG_HOME is undefined.

See XDG Base Directory Specification and ConfigParser.

The configuration file consists of newline-delineated [sections] containing key = value pairs. The sections [main] and [musicbrainz] are special config sections for options not accessible from the command line interface. Sections beginning with drive are written by whipper; certain values should not be edited.

Example configuration demonstrating all [main] and [musicbrainz] options:

[main]
path_filter_fat = True		; replace FAT file system unsafe characters in filenames with _
path_filter_special = False	; replace special characters in filenames with _

[musicbrainz]
server = musicbrainz.org:80	; use MusicBrainz server at host[:port]

[drive:HL-20]
defeats_cache = True		; whether the drive is capable of defeating the audio cache
read_offset = 6			; drive read offset in positive/negative frames (no leading +)
# do not edit the values 'vendor', 'model', and 'release'; they are used by whipper to match the drive

# command line defaults for `whipper cd rip`
[whipper.cd.rip]
unknown = True
output_directory = ~/My Music
track_template = new/%%A/%%y - %%d/%%t - %%n	; note: the format char '%' must be represented '%%'
disc_template =  new/%%A/%%y - %%d/%%A - %%d
# ...

Running uninstalled

To make it easier for developers, you can run whipper straight from the source checkout:

python2 -m whipper -h

Logger plugins

Whipper allows using external logger plugins to customize the template of .log files.

The available plugins can be listed with whipper cd rip -h. Specify a logger to rip with by passing -L loggername:

whipper cd rip -L eac

Whipper searches for logger plugins in the following paths:

  • $XDG_DATA_HOME/whipper/plugins

  • Paths returned by the following Python instruction:

    [x + '/whipper/plugins' for x in site.getsitepackages()]

  • If whipper is run in a virtualenv, it will use these alternative instructions (from distutils.sysconfig):

    • get_python_lib(plat_specific=False, standard_lib=False, prefix='/usr/local') + '/whipper/plugins'
    • get_python_lib(plat_specific=False, standard_lib=False) + '/whipper/plugins'

On a default Debian/Ubuntu installation, the following paths are searched by whipper:

  • $HOME/.local/share/whipper/plugins
  • /usr/local/lib/python2.7/dist-packages/whipper/plugins
  • /usr/lib/python2.7/dist-packages/whipper/plugins

Official logger plugins

I suggest using whipper's default logger unless you've got particular requirements.

License

Licensed under the GNU GPLv3 license.

Copyright (C) 2009 Thomas Vander Stichele
Copyright (C) 2016-2019 The Whipper Team: JoeLametta, Samantha Baldwin,
                        Merlijn Wajer, Frederik “Freso” S. Olesen, et al.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA

Contributing

Make sure you have the latest copy from our git repository. Where possible, please include tests for new or changed functionality. You can run tests with python -m unittest discover from your source checkout.

Developer Certificate of Origin (DCO)

To make a good faith effort to ensure licensing criteria are met, this project requires the Developer Certificate of Origin (DCO) process to be followed.

The Developer Certificate of Origin (DCO) is a document that certifies you own and/or have the right to contribute the work and license it appropriately. The DCO is used instead of a much more annoying CLA (Contributor License Agreement). With the DCO, you retain copyright of your own work :). The DCO originated in the Linux community, and is used by other projects like Git and Docker.

The DCO agreement is shown below and it's also available online: HERE.

Developer Certificate of Origin
Version 1.1

Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
1 Letterman Drive
Suite D4700
San Francisco, CA, 94129

Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.


Developer's Certificate of Origin 1.1

By making a contribution to this project, I certify that:

(a) The contribution was created in whole or in part by me and I
    have the right to submit it under the open source license
    indicated in the file; or

(b) The contribution is based upon previous work that, to the best
    of my knowledge, is covered under an appropriate open source
    license and I have the right under that license to submit that
    work with modifications, whether created in whole or in part
    by me, under the same open source license (unless I am
    permitted to submit under a different license), as indicated
    in the file; or

(c) The contribution was provided directly to me by some other
    person who certified (a), (b) or (c) and I have not modified
    it.

(d) I understand and agree that this project and the contribution
    are public and that a record of the contribution (including all
    personal information I submit with it, including my sign-off) is
    maintained indefinitely and may be redistributed consistent with
    this project or the open source license(s) involved.

DCO Sign-Off Methods

The DCO requires a sign-off message in the following format appear on each commit in the pull request:

Signed-off-by: Full Name <email>

The DCO text can either be manually added to your commit body, or you can add either -s or --signoff to your usual Git commit commands. If you forget to add the sign-off you can also amend a previous commit with the sign-off by running git commit --amend -s.

Bug reports & feature requests

Please use the issue tracker to report any bugs or to file feature requests.

When filing bug reports, please run the failing command with the environment variable WHIPPER_DEBUG set. For example:

WHIPPER_DEBUG=DEBUG WHIPPER_LOGFILE=whipper.log whipper offset find
gzip whipper.log

And attach the gzipped log file to your bug report.

Without WHIPPER_LOGFILE set, logging messages will go to stderr. WHIPPER_DEBUG accepts a string of the default python logging levels.

Credits

Thanks to:

And to all the contributors.

Links

You can find us and talk about the project on:

Other relevant links:

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Python CD-DA ripper preferring accuracy over speed

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