Amarok/Manual/Various/Moodbar/pt-br

A barra de atmosfera

A Barra de atmosfera retorna oficialmente ao Amarok desde a versão 2.2.2. Ela mostra-lhe a "atmosfera" de uma faixa, onde você pode usar para descobrir quando algo de interessante ocorrer na música.

Para o Amarok analisar os seus arquivos de música para criar barras de atmosfera, você precisa do programa Moodbar (veja abaixo para transferências e pacotes binários).

O pacote Moodbar necessita do GStreamer e de vários plugins que dependem dos tipos de arquivos que usar (veja os Tipos de arquivo suportados). Você não precisa do pacote phonon-backend-gstreamer para criar arquivos '.mood'.

Existem duas partes da nova implementação do Moodbar: o pacote Moodbar, que contém um programa que recebe um arquivo de música e gera um arquivo '.mood', e o código de suporte no código-fonte do Amarok, que executa o binário e mostra a barra de atmosfera. O pacote Moodbar depende das bibliotecas do GStreamer. Sem o pacote Moodbar, o Amarok não consegue gerar as barras de atmosfera da sua música.

Como alternativa, existe um novo script que irá criar arquivos moodbar para as faixas existentes em uma lista de músicas do Amarok; esta é uma exceção ao descrito acima. O script não precisa de nada, apensa que o Amarok funcione, mas só cria os arquivos '.mood' quando forem reproduzidos na Lista de músicas.

O Moodbar é derivado do trabalho de Gavin Wood e Simon O'Keefe, que escreveram os algoritmos; a sua publicação original está aqui.

Resumo de requisitos

• O executável do Moodbar, no seu PATH (deve aparecer se executar o comando

  which moodbar

  na linha de comando) — Lembre-se de configurar o pacote do Moodbar com

  ./configure --prefix=`pkg-config --variable=prefix gstreamer-0.10`

• A biblioteca do GStreamer 0.10 e os plugins dos formatos onde você deseja que o Moodbar pode analisar.

A biblioteca Fastest Fourier Transform In The West (fftw.org) FFTW na versão 3.0 ou superior (pelo menos a versão de ponto flutuante de precisão simples - libfftw3f) — Se a sua plataforma não tiver este suporte, ou caso precise compilar a sua própria versão, lembre-se de configurar o pacote FFTW com o comando

./configure --enable-single

• A version of Amarok with a Use moods option in the General section of the configuration screen. This means 1.4.4 or higher in the 1.4 series or 2.2.2 or higher in the 2.x series.

Information

Systems with package managers should automatically install the GStreamer plugins and FFTW along with the Moodbar package; this information is provided mostly for people who want or need to compile from source or manually install packages.

Usage

Currently .mood files must generated manually. To do this for your entire collection, use the Moodbar File Generation Script described below.

To enable the display of moodbars in Amarok, activate it in the configuration: Settings -> Configure Amarok -> General -> Show Moodbar in Progress Slider. Moodbars should now appear in the track sliders in the player window and Playlist; there will also be a mood field that you may add to your playlist layouts.

Installation

Source Downloads

Latest release: moodbar-0.1.2.tar.gz — this is the Moodbar source package, which contains the Moodbar program (which generates .mood files from music files), and a GStreamer plugin that does the work. The Moodbar package needs GStreamer 0.10.* installed, plus the 0.10.* version of various plugins. Be sure to install the Moodbar package into the same prefix as GStreamer — follow the instructions in the INSTALL file.

If you find any bugs, please submit a bug report at bugs.kde.org.

Debian packages

A package for Moodbar is now available in Debian unstable. Simply run

apt-get install moodbar

. You will likely also want to install gstreamer0.10-plugins-ugly, gstreamer0.10-plugins-good, and gstreamer0.10-plugins-bad for format support.

Kubuntu and Ubuntu packages

A package for Moodbar is available in the official package repository; just ensure the universe section is activated (which should be default anyway). Just install the package moodbar with your preferred package manager (Kpackagekit, Aptitude, Adept, Synaptic). You will likely also want to install gstreamer0.10-plugins-ugly, gstreamer0.10-plugins-good, and gstreamer0.10-plugins-bad for format support.

Or, to install, paste this into Firefox or Konqueror and hit Enter.

apt://moodbar,gstreamer0.10-plugins-ugly,gstreamer0.10-plugins-good,gstreamer0.10-plugins-bad?section=universe?refresh=yep

Gentoo ebuilds

Moodbar is available in Portage, simply

emerge moodbar

Unofficial ebuilds are no longer required.

RPM builds

If you are a rpm-based distro user, you can build a .rpm using rpmbuild with latest gstreamer-plugins-moodbar.spec. The binary package will be soon available for PLD-linux distro.

Fedora

In Fedora 7 and higher (up to 16 as of this writing) Moodbar is available in the default repositories. Simply install it with your PackageKit GUI or with the following yum command:

yum install moodbar

openSUSE packages

openSUSE 11.0 and later, automatically install the following packages:

• gstreamer-0_10-fluendo-mp3
• gstreamer-0_10-plugins-base

Also, if your songs contain ID3 tags, you must install

• gstreamer-0_10-plugins-good

Moodbar Installation

1-Click Install for openSUSE 11. - just choose your version and installation procedure will do the rest:

• openSUSE 11.2
• openSUSE 11.1

To install, add the correct repository for your version of openSUSE to YaST then make sure the following packages are installed:

• gstreamer-0_10-plugins-good
• gstreamer-0_10-plugins-ugly
• gstreamer-0_10-plugins-moodbar
• mad

For details on how to add repositories, see the openSUSE wiki.

If you are using the Smart software management tool, add the channel by entering the following at the command line, remember to change the URL to match your version of openSUSE:

smart channel --add http://software.opensuse.org/download/home:/d7/openSUSE_10.2/home:d7.repo

Then enter

smart update home:d7

You can now install the required packages by

smart install gstreamer10-plugins-moodbar

Dependencies are resolved automatically.

Mandriva packages

First of all, you need to add PLF repositories, so visit easyurpmi.zarb.org and add them to your repositories list. Then simply install the following packages:

• gstreamer0.10-moodbar
• gstreamer0.10-plugins-ugly
• gstreamer0.10-plugins-good
• gstreamer0.10-plugins-bad

Arch Linux

There is a PKGBUILD for Moodbar in the Arch User Repository (AUR) available here.

For more information about the AUR and working with PKGBUILDs, see the AUR User Guidelines.

FreeBSD

There is a port: audio/gstreamer-plugins-moodbar here.

To install the port:

cd /usr/ports/audio/gstreamer-plugins-moodbar/ && make install clean

To add the package:

pkg_add -r gstreamer-plugins-moodbar

Moodbar File Generation Script

Here is a simple bash script that will add .mood files to your entire collection. It adds mood files for all files matching the extensions in the current directory and all subdirectories, so it's best run from the base of your music directory.

#!/bin/bash
 DIR=${1:-.}
 LAST=~/.moodbar-lastreadsong
 C_RET=0
 
 control_c()        # run if user hits control-c
 {
   echo "" > "$LAST"
   echo "Exiting..."
   exit
 }
 
 if [ -e "$LAST" ]; then
   read filetodelete < "$LAST"
   rm "$filetodelete" "$LAST"
 fi
 exec 9< <(find "$DIR" -type f -regextype posix-awk -iregex '.*\.(mp3|ogg|flac|wma)') # you may need to add m4a and mp4
 while read i
 do
   TEMP="${i%.*}.mood"
   OUTF=`echo "$TEMP" | sed 's#\(.*\)/\([^,]*\)#\1/.\2#'`
   trap 'control_c "$OUTF"' INT
   if [ ! -e "$OUTF" ] || [ "$i" -nt "$OUTF" ]; then
     moodbar -o "$OUTF" "$i" || { C_RET=1; echo "An error occurred!" >&2; }
   fi
 done <&9
 exec 9<&-
 
 exit $C_RET

Copy and paste the above into a text file named moodbar.sh in your music directory and run the following commands:

cd /path/to/music
 bash moodbar.sh

Alternatively if the above does not work, you may try:

chmod +x moodbar.sh
 ./moodbar.sh

This may take a very long time for large collections! Note that the moodbars will not appear in Amarok until Amarok rescans the collection. The generated mood files will be dotfiles (i.e., prefixed with a full stop), or hidden files - so keep this in mind if you can't find any generated mood files.

Based on the above script, an alternative for multicore CPUs:

#!/bin/bash
 NUMCPU="$(grep ^processor /proc/cpuinfo | wc -l)"
 
 find . -type f -regextype posix-awk -iregex '.*\.(mp3|ogg|flac|wma)' | while read i ; do
 
        while [ `jobs -p | wc -l` -ge $NUMCPU ] ; do
                sleep 0.1
        done
 
        TEMP="${i%.*}.mood"
        OUTF=`echo "$TEMP" | sed 's#\(.*\)/\([^,]*\)#\1/.\2#'`
        if [ ! -e "$OUTF" ] ; then
                moodbar -o "$OUTF" "$i" &
        fi
 done

There is another script at Github, which shows previews of the generated mood files on the command line while they are being generated. Read more about it at the author's blog.

Troubleshooting

• If the Moodbar executable gives you a bus error, that almost always means it can't decode (or can't find) your file. Take a look at the supported file types below for ideas on which GStreamer plugins to install. You can also try the command below to test whether GStreamer can decode your file:

  gst-launch filesrc location=[file] ! decodebin ! fakesink

• If you are using the ffmpeg plugin to decode mp3s, you may also receive mysterious bus errors. The solution is to stop using the ffmpeg plugin, as it is extremely buggy — use mad instead.

• If the Moodbar executable tells you that it can't find an element — i.e., it gives an error message like

  Could not create element of type fftwspectrum, please install it.

  — that usually means that you either don't have the required plugins installed (see the plugin list here), or that you didn't install the Moodbar package in the same prefix as GStreamer. If libmoodbar.so and libgstdecodebin.so are not in the same directory, then Moodbar is not installed in the same prefix as GStreamer. Please read the INSTALL file for instructions on how to configure the moodbar package correctly. Alternatively, if you know what you're doing, it may be easier for you to take a look at the GST_PLUGIN_PATH environment variable.

• If you're wondering why the Moodbar isn't working, either not working at all or not working for a particular file, run the command below, where [file] is a music file:

  moodbar -o test.mood [file]

• If you have multiple versions of GStreamer installed, make sure all of the required plugins are installed for version 0.10.* -- different versions cannot use each other's plugins.

Supported Filetypes

You will need various Gstreamer plugins to enable Moodbar to analyze your files. Here is a list of the plugins you will need; make sure to install the 0.10.* version of each plugin:

Filetype	Required Plugin	Note
All	gstreamer-0.10.*, gst-plugins-base, gst-plugins-good
mp3	gst-plugins-mad (in gst-plugins-ugly)	ffmpeg plugin has problems; do not use for mp3
ogg	gst-plugins-vorbis, gst-plugins-ogg
flac	gst-plugins-flac
mp4	gst-plugins-faad, gst-plugins-bad
musepack	gst-plugins-musepack
wma	gst-plugins-ffmpeg

Screenshots

Moodbar in progress slider in Amarok 2

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