.. -*- coding: utf-8; -*-

========

 Audio.

========

.. contents::

   :local:

Sound in Debian.

================

 * http://wiki.debian.org/ALSA

 * http://wiki.debian.org/SoundFAQ

Test speaker and microphone.

============================

To configure audio devices::

  $ alsamixer

  $ pavucontrol

To hier voice from mic in speaker::

  $ arecord | aplay

  $ arecord -f cd | aplay -f cd

To list of available devices::

  $ aplay -l

  $ aplay -L

  $ arecord -l

  $ arecord -L

  $ pactl list

Play simple sounds.

===================

::

  $ sudo apt-get install sox

  $ play -n synth sin 440 vol -40dB

  $ play -n synth 10 square 100-10000 synth sin fmod 100 vol -40dB

Record from microphone

======================

::

  $ arecord -f cd -t raw | oggenc -r -o out.ogg -

Check HDA params.

=================

::

  $ sudo apt-get install alsa-tools-gui

  $ hdajackretask

See also:

  http://www.alsa-project.org/main/index.php/HDA_Analyzer

    provides a graphical interface to access the raw HD-audio control

Suitable convertors?

====================

::

  $ sudo apt-get install ffmpeg

or::

  $ sudo apt-get install sox

List of sox supported format: See sox(1).

List of ffmpeg supported format::

  $ ffmpeg -formats

How convert amr to ogg/mp3?

===========================

TODO

Converting music formats

========================

::

  $ sox in.mp3 out.ogg

  $ sox in.ogg out.wav

  ... etc

How convert flac to mp3?

========================

::

  $ flac -c -d $file.flac | lame -m j -q 0 -V 0 -s 44.1 - $file.mp3

How convert wma to mp3?

=======================

::

  $ mplayer -vo null -vc dummy -af resample=44100 -ao pcm:file=$file.wav $file.wma

  $ lame -m s $file.wav -o "$file.mp3

  $ rm $file.wav

How convert m4a to mp3?

=======================

::

  $ faad -o - $file.m4a | lame -V 0 - $file.mp3

How split mp3/ogg files?

========================

Split mp3 and ogg files::

  $ mp3splt

See::

  http://mp3splt.sourceforge.net/mp3splt_page/home.php

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