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209 lines
8.2 KiB
209 lines
8.2 KiB
<article lang="&language;" id="audiocd">
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<title>audiocd</title>
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<articleinfo>
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<authorgroup>
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<author>&Rik.Hemsley; &Rik.Hemsley.mail;</author>
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<author><personname><firstname>Benjamin</firstname><surname>Meyer</surname></personname></author>
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<!-- TRANS:ROLES_OF_TRANSLATORS -->
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</authorgroup>
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<date>2004-09-16</date>
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<releaseinfo>2.30.00</releaseinfo>
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</articleinfo>
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<para>Allows treating audio <acronym>CD</acronym>s like a
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<quote>real</quote> filesystem, where tracks are represented as files
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and, when copied from the folder, are digitally extracted from the
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<acronym>CD</acronym>. This ensures a perfect copy of the audio
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data.</para>
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<para>To see how this slave works, insert an audio <acronym>CD</acronym>
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in your &CD-ROM; drive and type <userinput>audiocd:/</userinput> into
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&konqueror;. Within a few seconds you should see a list of tracks and
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some folders.</para>
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<para>Audio <acronym>CD</acronym>s don't really have folders, but
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the audiocd slave provides them as a convenience. If you look inside
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these folders you will see that they all contain the same number of
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tracks. If you are connected to the Internet, some folders will have
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the actual track titles shown as the filenames.</para>
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<para>The reason that these separate folders exist are so that you
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can choose in which format you would like to listen to (or copy) the
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tracks on the <acronym>CD</acronym>.</para>
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<para>If you drag a track from the <filename class="directory">Ogg
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Vorbis</filename> folder and drop it on another &konqueror; window
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open at your home folder, you should see a progress window showing
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you that the track is being extracted from the <acronym>CD</acronym> and
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saved to a file. Note that Ogg Vorbis is a compressed format, so the
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file in your home folder will appear a great deal smaller than it
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would have been if you had copied the raw data.</para>
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<para>The mechanism behind this is quite simple. When the audiocd slave
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is asked to retrieve a track from the <filename class="directory">Ogg
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Vorbis</filename> folder, it starts extracting the digital audio data
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from the <acronym>CD</acronym>. As it sends the data over to the file in
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your home folder, it simultaneously encodes it in Ogg Vorbis format
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(<acronym>CD</acronym> audio is in an uncompressed format to start
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with).</para>
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<para>You could also try dragging a file ending in <literal
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role="extension">.wav</literal> and dropping it on the &kde; Media
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Player, &noatun;. In this case, the procedure that happens behind the
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scenes is similar, except that instead of encoding the audio data in Ogg
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Vorbis format, it is put through a very simple conversion, from raw
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binary data (which the <literal role="extension">.cda</literal> files in
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the toplevel folder represent) to <quote>RIFF WAV</quote> format, a
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non-compressed format that most media players understand.</para>
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<para>&noatun; should quite happily play the <literal
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role="extension">.wav</literal> file, but if it has trouble, you may
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consider using the <option>paranoia_level</option> option, explained
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below.</para>
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<variablelist>
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<title>Options</title>
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<varlistentry>
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<term><option>device</option></term>
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<listitem>
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<para>Set the path to the audio <acronym>CD</acronym> device, ⪚
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<userinput>audiocd:/<option>?device</option>=<parameter>/dev/sdc</parameter></userinput>.
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Normally, the slave will try to find a <acronym>CD</acronym> drive with
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an audio <acronym>CD</acronym> inserted, but if it fails or you have
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more than one <acronym>CD</acronym> drive, you may want to try this
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option. Note that the configuration dialog allows you to set a default
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value for this option.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>fileNameTemplate</option></term>
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<listitem>
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<para>Set the file name template, ⪚
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<userinput>audiocd:/<option>?fileNameTemplate</option>=<parameter>Track %{number}</parameter></userinput>. Note that the configuration dialog allows you to set a default value for this option. A warning that if you set it to an empty string no files will show up.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>albumNameTemplate</option></term>
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<listitem>
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<para>Set the album name template, ⪚
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<userinput>audiocd:/<option>?albumNameTemplate</option>=<parameter>%{albumartist} %{albumtitle}</parameter></userinput>. Note that the configuration dialog allows you to set a default value for this option.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>niceLevel</option></term>
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<listitem>
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<para>Sets the process nice level for encoders, ⪚
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<userinput>audiocd:/<option>?albumNameTemplate</option>=<parameter>niceLevel=10</parameter></userinput>. Note that the configuration dialog allows you to set a default value for this option.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>paranoia_level</option></term>
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<listitem>
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<para>Set the amount of error detection and correction used when
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extracting data.</para>
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<variablelist>
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<varlistentry>
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<term>Level 0</term>
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<listitem>
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<para>No detection or correction. Only useful if you have a perfect
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<acronym>CD</acronym> drive (unlikely).</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>Level 1</term>
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<listitem>
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<para>Enable basic error checking and correction.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>Level 2</term>
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<listitem>
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<para>Default. Specifies that only a perfect extraction will be
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accepted.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>Note that there is a disadvantage to level 2. Extraction can be
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very slow, so real-time digital playback may not work properly. If you
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have a good quality <acronym>CD</acronym> drive (note that more
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expensive does not necessarily mean better quality) then you probably
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won't experience very slow extraction, but a poor drive may take days
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(!) to extract the audio from one <acronym>CD</acronym>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>cddbChoice</option></term>
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<listitem>
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<para>Specify which Internet <acronym>CD</acronym> Database entry to use. Audio
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<acronym>CD</acronym>s don't have track names, but the Internet
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<acronym>CD</acronym> Database is a clever system which uses a special
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unique identifier generated from the number and length of tracks on each
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<acronym>CD</acronym> to cross-reference a track listing. Track listings
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are contributed by the Internet community and made available to
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all. Occasionally there will be multiple entries. You can specify which one to use.</para>
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<para>You can submit your own track listings using &kscd;, the &kde;
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<acronym>CD</acronym> player.</para>
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<para>By default audiocd tries to pick the best one.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<variablelist>
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<title>Examples</title>
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<varlistentry>
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<term><userinput>audiocd:/?device=/dev/scd0&paranoia_level=0&cddbChoice=0</userinput></term>
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<listitem>
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<para>Gives a listing of the tracks on the audio <acronym>CD</acronym>
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inserted in <filename class="devicefile">/dev/scd0</filename>, which on
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&Linux; specifies the first <acronym>SCSI</acronym> &CD-ROM; device. If
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you copy tracks from the <acronym>CD</acronym>, digital extraction will
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be performed without error correction or detection. The
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<acronym>CDDB</acronym> Database entry 0 will be used.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<qandaset>
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<title>Frequently Asked Question</title>
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<qandaentry>
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<question>
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<para>I get <errorname>The file or folder / does not
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exist</errorname>. How do I fix that? I have an audio
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<acronym>CD</acronym> in my drive!</para>
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</question>
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<answer>
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<para>Try running <userinput><command>cdparanoia</command>
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<option>-vsQ</option></userinput> as yourself (not <systemitem
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class="username">root</systemitem>). Do you see a track list? If not,
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make sure you have permission to access the <acronym>CD</acronym>
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device. If you're using <acronym>SCSI</acronym> emulation (possible if
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you have an <acronym>IDE</acronym> <acronym>CD</acronym> writer) then
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make sure you check that you have read and write permissions on the
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generic <acronym>SCSI</acronym> device, which is probably <filename
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class="devicefile">/dev/sg0</filename>, <filename
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class="devicefile">/dev/sg1</filename>, &etc;. If it still doesn't work,
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try typing <userinput>audiocd:/?device=/dev/sg0</userinput> (or similar)
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to tell tdeio_audiocd which device your &CD-ROM; is.</para>
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</answer>
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</qandaentry>
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</qandaset>
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</article>
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