path: root/DOCS/xml/en/codecs.xml

<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision$ -->
<chapter id="codecs">
<title>Codecs</title>

<sect1 id="video-codecs">
<title>Video codecs</title>

<para>
The <ulink url="../../codecs-status.html">codec status table</ulink> is a
complete list of all supported codecs, regenerated daily.
Some binary codecs for use with MPlayer are available in the
<ulink url="http://www.mplayerhq.hu/design7/dload.html#binary_codecs">download section</ulink>
of our homepage.
</para>

<para>
The most important ones above all:
</para>

<itemizedlist>
<listitem><simpara>
  <emphasis role="bold">MPEG-1</emphasis> (<emphasis role="bold">VCD</emphasis>) and
  <emphasis role="bold">MPEG-2</emphasis> (<emphasis role="bold">DVD</emphasis>) video
  </simpara></listitem>
<listitem><simpara>
  native decoders for <emphasis role="bold">DivX ;-), OpenDivX (DivX4),
  DivX 5 (Pro), 3ivX, M$ MPEG-4</emphasis> v1, v2 and other MPEG-4 variants
  </simpara></listitem>
<listitem><simpara>
  native decoder for <emphasis role="bold">Windows Media Video 7/8</emphasis>
  (<emphasis role="bold">WMV1/WMV2</emphasis>), and Win32 DLL decoder
  for <emphasis role="bold">Windows Media Video 9</emphasis>
  (<emphasis role="bold">WMV3</emphasis>), both used in <filename>.wmv</filename>
  files
  </simpara></listitem>
<listitem><simpara>
  native <emphasis role="bold">Sorenson 1 (SVQ1)</emphasis> decoder
  </simpara></listitem>
<listitem><simpara>
  native <emphasis role="bold">Sorenson 3 (SVQ3)</emphasis> decoder
  </simpara></listitem>
<listitem><simpara>
  <emphasis role="bold">3ivx</emphasis> v1, v2 decoder
  </simpara></listitem>
<listitem><simpara>
  Cinepak and <emphasis role="bold">Intel Indeo</emphasis> codecs (3.1,3.2,4.1,5.0)
  </simpara></listitem>
<listitem><simpara>
  <emphasis role="bold">MJPEG</emphasis>, AVID, VCR2, ASV2 and other hardware
  formats
  </simpara></listitem>
<listitem><simpara>
  VIVO 1.0, 2.0, I263 and other <emphasis role="bold">H.263(+)</emphasis> variants
  </simpara></listitem>
<listitem><simpara>
  FLI/FLC
  </simpara></listitem>
<listitem><simpara>
  <emphasis role="bold">RealVideo 1.0 &amp; 2.0</emphasis> from
  <systemitem class="library">libavcodec</systemitem>, and
  <emphasis role="bold">RealVideo 3.0 &amp; 4.0</emphasis> codecs using RealPlayer
  libraries
  </simpara></listitem>
<listitem><simpara>
  native decoder for HuffYUV
  </simpara></listitem>
<listitem><simpara>
  Various old simple RLE-like formats
  </simpara></listitem>
</itemizedlist>

<para>
If you have a Win32 codec not listed here which is not supported yet,
please read the <link linkend="codec-importing">codec importing HOWTO</link>
and help us add support for it.
</para>


<sect2 id="ffmpeg" xreflabel="FFmpeg/libavcodec">
<title>FFmpeg/libavcodec</title>

<para>
<ulink url="http://ffmpeg.org">FFmpeg</ulink> contains an
<emphasis role="bold">open source</emphasis> codec package, which is capable
of decoding streams with various audio and video codecs. It also offers an
impressing encoding facility and higher speed than the Win32 codecs or the
DivX.com DivX4/5 libraries!
</para>

<para>
It contains a lot of nice codecs, especially important are the MPEG-4 variants:
DivX3, DivX4, DivX5, Windows Media Video 7/8 (WMV1/WMV2). Also a very interesting one
is the WMA decoder.
</para>

<para>
The most recent codec deserving credit is the <emphasis role="bold">Sorenson 3</emphasis>
(SVQ3) codec. This is the first, completely opensource implementation. It is even
faster than the original. Be sure to prefer this instead of the binary codec!
</para>

<para>
For a complete list of supported codecs please visit the FFmpeg homepage.
Supported <ulink url="http://ffmpeg.org/ffmpeg-doc.html#SEC19">video</ulink>
and <ulink url="http://ffmpeg.org/ffmpeg-doc.html#SEC20">audio</ulink> codecs.
</para>

<para>
Both <application>MPlayer</application> releases and
<application>MPlayer</application> from Subversion contain
<systemitem class="library">libavcodec</systemitem> so you don't have
to care about making a separate <systemitem class="library">libavcodec</systemitem> checkout.
Just run <filename>configure</filename> and compile.
</para>

<para>
With FFmpeg and my Matrox G400, I can view even the highest resolution DivX
movies without dropped frames on my K6-2 500.
</para>
</sect2>


<sect2 id="xanim">
<title>XAnim codecs</title>

<note>
<para>
Be advised that the XAnim binary codecs are packaged with a piece of text
claiming to be a legally binding software license which, besides other
restrictions, forbids the user to use the codecs in conjunction with any
program other than <application>XAnim</application>. However, the XAnim
author has yet to bring legal action against anyone for codec-related issues.
</para>
</note>

<formalpara>
<title>INSTALLATION AND USAGE</title>
<para>
<application>MPlayer</application> is capable of employing the XAnim codecs
for decoding. Follow the instructions to enable them:
</para>
</formalpara>

<procedure>
<step><para>
  Download the codecs you wish to use from the
  <ulink url="http://xanim.polter.net/">XAnim site</ulink>.
  The <emphasis role="bold">3ivx</emphasis> codec is not there, but at the
  <ulink url="http://www.3ivx.com">3ivx site</ulink>.
  </para></step>
<step><para>
  <emphasis role="bold">OR</emphasis> download the codecs pack from our
  <ulink url="http://www.mplayerhq.hu/MPlayer/releases/codecs/">codecs page</ulink>
  </para></step>
<step><para>
  Use the <option>--with-xanimlibdir</option> option to tell
  <filename>configure</filename> where
  to find the XAnim codecs. By default, it looks for them at
  <filename class="directory">/usr/local/lib/codecs</filename>,
  <filename class="directory">/usr/local/lib/xanim/mods</filename>,
  <filename class="directory">/usr/lib/xanim/mods</filename> and
  <filename class="directory">/usr/lib/xanim</filename>.
  Alternatively you can set the environment variable
  <envar>XANIM_MOD_DIR</envar> to the directory of the XAnim codecs.
  </para></step>
<step><para>
  Rename/symlink the files, cutting out the architecture stuff, so they
  will have filenames like these: <filename>vid_cvid.xa</filename>,
  <filename>vid_h263.xa</filename>, <filename>vid_iv50.xa</filename>
  </para></step>
</procedure>

<para>
XAnim is video codec family <systemitem>xanim</systemitem>, so you may want
to use the <option>-vfm xanim</option> option to tell <application>MPlayer</application>
to use them if possible.
</para>

<para>
Tested codecs include: <emphasis role="bold">Indeo 3.2, 4.1, 5.0, CVID, 3ivX,
H.263.</emphasis>
</para>
</sect2>


<sect2 id="vivo-video">
<title>VIVO video</title>
<para>
<application>MPlayer</application> can play Vivo (1.0 and 2.0) videos. The
most suitable codec for 1.0 files is FFmpeg's H.263 decoder, you can use it
with the <option>-vc ffh263</option> option. For 2.0 files, use the
Win32 DLL through the <option>-vc vivo</option> option. If you do not supply
command line options <application>MPlayer</application> selects the best codec
automatically.
</para>
</sect2>


<sect2 id="mpeg12">
<title>MPEG-1/2 video</title>
<para>
MPEG-1 and MPEG-2 are decoded by the multiplatform native <systemitem
class="library">libmpeg2</systemitem> library, whose source code is
included in <application>MPlayer</application>.  We handle buggy MPEG-1/2
video files by catching <systemitem>Signal 11</systemitem>
(<systemitem>segmentation fault</systemitem>), and quickly
reinitializing the codec, continuing exactly from where the failure
occurred.  This recovery technique has no measurable speed penalty.
</para>
</sect2>


<sect2 id="avicodecs">
<title>MS Video1, Cinepak CVID, and other older codecs</title>
<para>
<application>MPlayer</application> is able to play most of the older codecs
used in AVI and MOV files.
In the past they were decoded with binary Win32 codecs, but now we have
<emphasis role="bold">native codecs</emphasis> for most of them using
<link linkend="ffmpeg"><systemitem class="library">libavcodec</systemitem></link>.
</para>
</sect2>


<sect2 id="realvideo">
<title>RealVideo</title>

<para>
<application>MPlayer</application> supports decoding all versions of
RealVideo:

<itemizedlist>
<listitem><simpara>
  RealVideo 1.0, 2.0 (fourcc RV10, RV20) - en/decoding supported by
  <systemitem class="library">libavcodec</systemitem>
  </simpara></listitem>
<listitem><simpara>
  RealVideo 3.0, 4.0 (fourcc RV30, RV40) - decoding supported by
  <emphasis role="bold">RealPlayer libraries</emphasis>
  </simpara></listitem>
</itemizedlist>
</para>

<para>
Download Real codecs from
<ulink url="http://www.mplayerhq.hu/MPlayer/releases/codecs/">http://www.mplayerhq.hu/MPlayer/releases/codecs/</ulink>
and extract them to the
<filename class="directory">/usr/local/lib/codecs</filename> directory.
If you want to store them in a different location, pass the
<option>--with-reallibdir</option> option to <command>configure</command>.
</para>

<note><para>
<application>RealPlayer</application> libraries currently
<emphasis role="bold">only work with Linux, FreeBSD, NetBSD and Cygwin on the x86,
Alpha and PowerPC (Linux/Alpha and Linux/PowerPC have been tested) platforms and with Mac OS X</emphasis>.
</para></note>
</sect2>


<sect2 id="xvid">
<title>XviD</title>

<para>
<ulink url="http://www.xvid.org">XviD</ulink> is a free software MPEG-4 ASP
compliant video codec, which features two pass encoding and full MPEG-4 ASP
support, making it a lot more efficient than the well-known DivX codec.
It yields very good video quality and good performance due to CPU
optimizations for most modern processors.
</para>
<para>
It began as a forked development of the OpenDivX codec.
This happened when ProjectMayo changed OpenDivX to closed source
DivX4 (now DivX5), and the non-ProjectMayo people working on OpenDivX got angry,
then started XviD. So both projects have the same origin.
</para>

<procedure>
<title>Installing <systemitem class="library">XviD</systemitem></title>
<para>
  Like most open source software, it is available in two flavors:
  <ulink url="http://www.xvid.org/downloads.html">official releases</ulink>
  and the CVS version.
  The CVS version is usually stable enough to use, as most of the time it
  features fixes for bugs that exist in releases.
  Here is what to do to make <systemitem class="library">XviD</systemitem>
  CVS work with <application>MEncoder</application> (you need at least
  <application>autoconf</application> 2.50,
  <application>automake</application> and <application>libtool</application>):
</para>
<step><para>
  <screen>cvs -z3 -d:pserver:anonymous@cvs.xvid.org:/xvid login</screen>
  </para></step>
<step><para>
  <screen>cvs -z3 -d:pserver:anonymous@cvs.xvid.org:/xvid co xvidcore</screen>
</para></step>
<step><para>
  <screen>cd xvidcore/build/generic</screen>
  </para></step>
<step><para>
  <screen>./bootstrap.sh</screen>
  </para></step>
<step><para>
  <screen>./configure</screen>
  You may have to add some options (examine the output of
  <command>./configure --help</command>).
  </para></step>
<step><para>
  <screen>make &amp;&amp; make install</screen>
  </para></step>
<step><para>
  If you specified <option>--enable-divxcompat</option>,
  copy <filename>../../src/divx4.h</filename> to
  <filename class="directory">/usr/local/include/</filename>.
  </para></step>
<step><para>
  Recompile <application>MPlayer</application> with
  <option>--with-xvidlibdir=<replaceable>/path/to/</replaceable>libxvidcore.a</option>
  <option>--with-xvidincdir=<replaceable>/path/to/</replaceable>xvid.h</option>
  </para></step>
</procedure>
</sect2>


<sect2 id="sorenson">
<title>Sorenson</title>

<para>
Sorenson is a video codec developed by Sorenson Media and licensed to Apple who
distribute it with their <application>QuickTime Player</application>. We are
currently able to decode all version of Sorenson video files with the following
decoders:
</para>

<itemizedlist>
<listitem><simpara>
  Sorenson Video v1 (fourcc <emphasis>SVQ1</emphasis>) - decoding supported
  by <emphasis role="bold">native codec</emphasis>
  (<link linkend="ffmpeg"><systemitem class="library">libavcodec</systemitem></link>)
  </simpara></listitem>
<listitem><simpara>
  Sorenson Video v3 (fourcc <emphasis>SVQ3</emphasis>) - decoding supported by
  <emphasis role="bold">native codec</emphasis>
  (<link linkend="ffmpeg"><systemitem class="library">libavcodec</systemitem></link>)
  </simpara></listitem>
</itemizedlist>

<procedure>
<title>COMPILING MPLAYER WITH QUICKTIME LIBRARIES SUPPORT</title>
<note><para>Currently only 32-bit Intel platforms are supported.</para></note>
<step><para>download <application>MPlayer</application> Subversion</para></step>
<step><para>download QuickTime DLL pack from
<ulink url="http://www.mplayerhq.hu/MPlayer/releases/codecs/"/>
</para></step>
<step><para>extract QuickTime DLL pack to your Win32 codecs directory
(default: <filename class="directory">/usr/local/lib/codecs/</filename>)
</para></step>
<step><para>compile <application>MPlayer</application></para></step>
</procedure>

</sect2>

<sect2 id="codec-x264">
<title>x264</title>

<sect3 id="codec-x264-whatis">
<title>What is x264?</title>
<para>
  <systemitem class="library">x264</systemitem> is a library for
  creating H.264 video streams.
  It is not 100% complete, but currently it has at least some kind
  of support for most of the H.264 features which impact quality.
  There are also many advanced features in the H.264 specification
  which have nothing to do with video quality per se; many of these
  are not yet implemented in
  <systemitem class="library">x264</systemitem>.
</para>

<itemizedlist>
<title>Encoder features</title>
  <listitem><para>CAVLC/CABAC</para></listitem>
  <listitem><para>Multi-references</para></listitem>
  <listitem><para>Intra: all macroblock types (16x16, 8x8, and 4x4 with
    all predictions)</para></listitem>
  <listitem><para>Inter P: all partitions (from 16x16 down to
    4x4)</para></listitem>
  <listitem><para>Inter B: partitions from 16x16 down to 8x8
    (including SKIP/DIRECT)</para></listitem>
  <listitem><para>Ratecontrol: constant quantizer, constant bitrate,
    single or multipass ABR, optional VBV</para></listitem>
  <listitem><para>Scene cut detection</para></listitem>
  <listitem><para>Adaptive B-frame placement</para></listitem>
  <listitem><para>B-frames as references / arbitrary frame
    order</para></listitem>
  <listitem><para>8x8 and 4x4 adaptive spatial transform</para></listitem>
  <listitem><para>Lossless mode</para></listitem>
  <listitem><para>Custom quantization matrices</para></listitem>
  <listitem><para>Parallel encoding of multiple slices</para></listitem>
</itemizedlist>

</sect3>

<sect3 id="codec-h264-whatis">
<title>What is H.264?</title>
<para>
  H.264 is one name for a new digital video codec jointly developed
  by the ITU and MPEG.
  It can also be correctly referred to by the cumbersome names of
  "ISO/IEC 14496-10" or "MPEG-4 Part 10".
  More frequently, it is referred to as "MPEG-4 AVC" or just "AVC".
</para>
<para>
  Whatever you call it, H.264 may be worth trying because it can
  typically match the quality of MPEG-4 ASP with 5%-30% less
  bitrate.
  Actual results will depend on both the source material and the
  encoder.
  The gains from using H.264 do not come for free: Decoding H.264
  streams seems to have steep CPU and memory requirements.
  For instance, on a 1733 MHz Athlon, a DVD-resolution 1500kbps H.264
  video requires around 35% CPU to decode.
  By comparison, decoding a DVD-resolution 1500kbps MPEG-4 ASP stream
  requires around 10% CPU.
  This means that decoding high-definition streams is almost out of
  the question for most users.
  It also means that even a decent DVD rip may sometimes stutter on
  processors slower than 2.0 GHz or so.
</para>
<para>
  At least with <systemitem class="library">x264</systemitem>,
  encoding requirements are not much worse than what you are used to
  with MPEG-4 ASP.
  For instance, on a 1733 MHz Athlon a typical DVD encode would run
  at 5-15fps.
</para>
<para>
  This document is not intended to explain the details of H.264,
  but if you are interested in a brief overview, you may want to read
  <ulink url="http://www.cdt.luth.se/~peppar/kurs/smd151/spie04-h264OverviewPaper.pdf">The H.264/AVC Advanced Video Coding Standard: Overview and Introduction to the Fidelity Range Extensions</ulink>.
</para>
</sect3>

<sect3 id="codec-x264-playback">
<title>How can I play H.264 videos with <application>MPlayer</application>?</title>
<para>
  <application>MPlayer</application> uses
  <systemitem class="library">libavcodec</systemitem>'s H.264
  decoder.
  <systemitem class="library">libavcodec</systemitem> has had at
  least minimally usable H.264 decoding since around July 2004,
  however major changes and improvements have been implemented since
  that time, both in terms of more functionalities supported and in
  terms of improved CPU usage.
  Just to be certain, it is always a good idea to use a recent Subversion
  checkout.
</para>
<para>
  If you want a quick and easy way to know whether there have been
  recent changes to <systemitem class="library">libavcodec</systemitem>'s
  H.264 decoding, you might keep an eye on 
  <ulink url="http://svn.mplayerhq.hu/ffmpeg/trunk/libavcodec/h264.c?view=log">FFmpeg Subversion repository's web interface</ulink>.
</para>
</sect3>

<sect3 id="codec-x264-encode">
<title>How can I encode videos using <application>MEncoder</application> and <systemitem class="library">x264</systemitem>?</title>
<para>
  If you have the subversion client installed, the latest x264
  sources can be gotten with this command:
  <screen>
    svn co svn://svn.videolan.org/x264/trunk x264<!--
  --></screen>
  <application>MPlayer</application> sources are updated whenever
  an <systemitem class="library">x264</systemitem> API change
  occurs, so it is always suggested to use
  <application>MPlayer</application> from Subversion as well.
  Perhaps this situation will change when and if an
  <systemitem class="library">x264</systemitem> "release" occurs.
  Meanwhile, <systemitem class="library">x264</systemitem> should
  be considered very unstable, in the sense that its programming
  interface is subject to change.
</para>
<para>
  <systemitem class="library">x264</systemitem> is built and
  installed in the standard way:
  <screen>
    ./configure &amp;&amp; make &amp;&amp; sudo make install<!--
  --></screen>
  This installs libx264.a in /usr/local/lib and x264.h is placed in
  /usr/local/include.

  With the <systemitem class="library">x264</systemitem> library
  and header placed in the standard locations, building
  <application>MPlayer</application> with
  <systemitem class="library">x264</systemitem> support is easy.
  Just run the standard:
  <screen>./configure &amp;&amp; make &amp;&amp; sudo make install</screen>
  The configure script will autodetect that you have satisfied the
  requirements for <systemitem class="library">x264</systemitem>.
</para>
</sect3>
</sect2>
</sect1>

<!-- ********** -->

<sect1 id="audio-codecs">
<title>Audio codecs</title>

<itemizedlist>
<title>The most important audio codecs above all:</title>
<listitem><simpara>
  MPEG layer 1/2/3 (MP1/2/3) audio (<emphasis role="bold">native</emphasis>
  code, with MMX/SSE/3DNow! optimization)
  </simpara></listitem>
<listitem><simpara>
  Windows Media Audio 7 and 8 (AKA WMAv1 and WMAv2) (<emphasis role="bold">native</emphasis> code, with
  <link linkend="ffmpeg"><systemitem class="library">libavcodec</systemitem></link>)
  </simpara></listitem>
<listitem><simpara>
  Windows Media Audio 9 (WMAv3) (using DMO DLL)
  </simpara></listitem>
<listitem><simpara>
  AC3 Dolby audio (<emphasis role="bold">native</emphasis> code, with
  MMX/SSE/3DNow! optimization)
  </simpara></listitem>
<listitem><simpara>
  AC3 passing through sound card hardware
  </simpara></listitem>
<listitem><simpara>
  AAC
  </simpara></listitem>
<listitem><simpara>
  Ogg Vorbis audio codec (<emphasis role="bold">native</emphasis> library)
  </simpara></listitem>
<listitem><simpara>
  RealAudio: DNET (low bitrate AC3), Cook, Sipro and ATRAC3
  </simpara></listitem>
<listitem><simpara>
  QuickTime: Qualcomm and QDesign audio codecs
  </simpara></listitem>
<listitem><simpara>
  VIVO audio (g723, Vivo Siren)
  </simpara></listitem>
<listitem><simpara>
  Voxware audio (using DirectShow DLL)
  </simpara></listitem>
<listitem><simpara>
  alaw and ulaw, various gsm, adpcm and pcm formats and other simple old
  audio codecs
  </simpara></listitem>
<listitem><simpara>
  Adaptive Multi-Rate (AMR) speech codecs
  </simpara></listitem>
</itemizedlist>


<sect2 id="swac3">
<title>Software AC3 decoding</title>

<para>
This is the default decoder used for files with AC3 audio.
</para>

<para>
The AC3 decoder can create audio output mixes for 2, 4, or 6 speakers.
When configured for 6 speakers, this decoder provides separate output of
all the AC3 channels to the sound driver, allowing for full "surround
sound" experience without the external AC3 decoder required to use the
hwac3 codec.
</para>

<para>
Use the <option>-channels</option> option to select the number of output
channels.  Use <option>-channels 2</option> for a stereo downmix.  For a 4
channel downmix (Left Front, Right Front, Left Surround and Right Surround
outputs), use <option>-channels 4</option>.  In this case, any center
channel will be mixed equally to the front channels.  <option>-channels
6</option> will output all the AC3 channels as they are encoded - in the
order Left, Right, Left Surround, Right Surround, Center and LFE.
</para>

<para>
The default number of output channels is 2.
</para>

<para>
To use more than 2 output channels, you will need to use OSS, and have a
sound card that supports the appropriate number of output channels via the
SNDCTL_DSP_CHANNELS ioctl.  An example of a suitable driver is emu10k1
(used by Soundblaster Live! cards) from August 2001 or newer (ALSA CVS is
also supposed to work).
</para>
</sect2>


<sect2 id="hwac3">
<title>Hardware AC3 decoding</title>
<para>
You need an AC3 capable sound card, with digital out (S/PDIF). The card's
driver must properly support the AFMT_AC3 format (C-Media does).  Connect
your AC3 decoder to the S/PDIF output, and use the <option>-ac
hwac3</option> option. It is experimental but known to work with C-Media
cards and Soundblaster Live! + ALSA (but not OSS) drivers and DXR3/Hollywood+
MPEG decoder cards.
</para>
</sect2>


<sect2 id="libmad">
<title>libmad support</title>

<para>
<ulink url="http://www.underbit.com/products/mad/">libmad</ulink> is a multiplatform,
integer (internally 24bit PCM) only
MPEG audio decoding library. It does not handle broken files well, and it
sometimes has problems with seeking, but it may perform better on FPU-less
(such as <link linkend="arm">ARM</link>) platform than mp3lib.
</para>

<para>
To enable support, compile with the <option>--enable-mad</option> configure
option.
</para>
</sect2>

<sect2 id="hwmpa">
<title>Hardware MPEG audio codec</title>

<para>
This codec (selected by -ac hwmpa) passes through MPEG audio packets 
to hardware decoders, such as the ones found in full-featured DVB cards 
and DXR2 adapters.
Don't use it in combination with any other audio output device
(such as OSS and ALSA) that isn't able to decode it (you will hear
only white noise).
</para>
</sect2>


<sect2 id="vivo-audio">
<title>VIVO audio</title>
<para>
The audio codec used in VIVO files depends on whether it is a VIVO/1.0 or
VIVO/2.0 file. VIVO/1.0 files have <emphasis role="bold">g.723</emphasis> audio,
and VIVO/2.0 files have <emphasis role="bold">Vivo Siren</emphasis> audio. Both are
supported.
</para>
</sect2>


<sect2 id="realaudio">
<title>RealAudio</title>

<para>
<application>MPlayer</application> supports decoding nearly all versions of
RealAudio:
</para>

<itemizedlist>
<listitem><simpara>
  RealAudio DNET - decoding supported by
  <systemitem class="library">liba52</systemitem>
  </simpara></listitem>
<listitem><simpara>
  RealAudio Cook/Sipro/ATRAC3 - decoding supported by
  <emphasis role="bold">RealPlayer libraries</emphasis>
  </simpara></listitem>
</itemizedlist>

<para>
Instructions on how to install the RealPlayer libraries are in the
<link linkend="realvideo">RealVideo</link> section.
</para>
</sect2>

<sect2 id="qdesign">
<title>QDesign codecs</title>
<para>
QDesign audio streams (fourcc:<emphasis>QDMC, QDM2</emphasis>) are found
in MOV/QT files. Both versions of this codec can be decoded with QuickTime
libraries. For installation instructions please see the
<link linkend="sorenson">Sorenson video codec</link> section.
</para>
</sect2>

<sect2 id="qualcomm">
<title>Qualcomm codecs</title>
<para>
Qualcomm audio streams (fourcc:<emphasis>Qclp</emphasis>) is found
in MOV/QT files. It can be decoded with QuickTime
libraries. For installation instructions please see the
<link linkend="sorenson">Sorenson video codec</link> section.
</para>
</sect2>

<sect2 id="aac">
<title>AAC codec</title>
<para>
AAC (Advanced Audio Coding) is an audio codec sometimes found in MOV and MP4
files. An open source decoder called FAAD is available from
<ulink url="http://www.audiocoding.com"/>.
<application>MPlayer</application> includes a CVS snapshot of libfaad 2.1
beta, so you do not need to get it separately.
</para>

<para>
If you use gcc 3.2 which fails to compile our internal FAAD or want to use
the external library for some other reason, download the library from the
<ulink url="http://www.audiocoding.com/modules/mydownloads/">download page</ulink>
and pass <option>--enable-external-faad</option> to <filename>configure</filename>.
You do not need all of faad2 to decode AAC files, libfaad is enough. Build
it like this:
<screen>
cd faad2/
sh bootstrap
./configure
cd libfaad
make
make install
</screen>
Binaries are not available from audiocoding.com, but you can (apt-)get Debian
packages from <ulink url="http://www.debian-multimedia.org/">Christian Marillat's homepage</ulink>,
Mandrake/Mandriva RPMs from the <ulink url="http://plf.zarb.org">P.L.F</ulink> and RedHat RPMs
from <ulink url="http://greysector.rangers.eu.org/">Grey Sector</ulink>.
</para>
</sect2>

<sect2 id="amr">
<title>AMR codecs</title>
<para>
Adaptive Multi-Rate speech codec is used in third generation (3G) mobile
phones.
Reference implementation is available from
<ulink url="http://www.3gpp.org">The 3rd Generation Partnership Project</ulink>
(free for private use).
</para>
<para>
To enable support, download the sources for
<ulink url="http://www.3gpp.org/ftp/Specs/latest/Rel-6/26_series/26104-610.zip">AMR-NB</ulink>
and
<ulink url="http://www.3gpp.org/ftp/Specs/latest/Rel-6/26_series/26204-600.zip">AMR-WB</ulink>
codecs, put them in the directory where you unpacked the
<application>MPlayer</application> source and run the following commands:
<screen>
unzip 26104-610.zip
unzip 26104-610_ANSI_C_source_code.zip
mv c-code libavcodec/amr_float
unzip 26204-600.zip
unzip 26204-600_ANSI-C_source_code.zip
mv c-code libavcodec/amrwb_float
</screen>
After that, follow the usual <application>MPlayer</application>
<link linkend="features">build procedure</link>.
</para>
</sect2>

</sect1>

<!-- ********** -->

<sect1 id="codec-importing">
<title>Win32 codecs importing HOWTO</title>

<!-- TODO: a short paragraph of text would be nice here... -->

<sect2 id="vfw-codecs">
<title>VFW codecs</title>

<para>
VFW (Video for Windows) is the old Video API for Windows. Its codecs have
the <filename>.DLL</filename> or (rarely) <filename>.DRV</filename>
extension.  If <application>MPlayer</application> fails at playing your AVI
with this kind of message:
<screen>UNKNOWN video codec: HFYU (0x55594648)</screen>
</para>

<para>
It means your AVI is encoded with a codec which has the HFYU fourcc (HFYU =
HuffYUV codec, DIV3 = DivX Low Motion, etc.). Now that you know this, you
have to find out which DLL Windows loads in order to play this file. In our
case, the <filename>system.ini</filename> contains this information in a
line that reads:
<programlisting>VIDC.HFYU=huffyuv.dll</programlisting>
</para>

<para>
So you need the <filename>huffyuv.dll</filename> file. Note that the audio
codecs are specified by the MSACM prefix:
<programlisting>msacm.l3acm=L3codeca.acm</programlisting>
</para>

<para>
This is the MP3 codec.  Now that you have all the necessary information
(fourcc, codec file, sample AVI), submit your codec support request by
mail, and upload these files to the FTP site:
<systemitem role="url">
ftp://upload.mplayerhq.hu/MPlayer/incoming/[codecname]/
</systemitem>
</para>

<note><para>On Windows NT/2000/XP search for this info in the registry,
e.g. search for &quot;VIDC.HFYU&quot;. To find out how to do this, look at
the old DirectShow method below.
</para></note>
</sect2>


<sect2 id="dshow-codecs">
<title>DirectShow codecs</title>

<para>
DirectShow is the newer Video API, which is even worse than its predecessor.
Things are harder with DirectShow, since
<itemizedlist>
<listitem><simpara>
  <filename>system.ini</filename> does not contain the needed information,
  instead it is stored in the registry and
  </simpara></listitem>
<listitem><simpara>
  we need the GUID of the codec.
  </simpara></listitem>
</itemizedlist>
</para>

<procedure>
<title>New Method:</title>
<para>
Using <application>Microsoft GraphEdit</application> (fast)
</para>
<step><para>
  Get <application>GraphEdit</application> from either DirectX SDK or
  <ulink url="http://doom9.net">doom9</ulink>
  </para></step>
<step><para>
  Start <command>graphedit.exe</command>.
  </para></step>
<step><para>
  From the menu select Graph -> Insert Filters.
  </para></step>
<step><para>
  Expand item <systemitem>DirectShow Filters</systemitem>
  </para></step>
<step><para>
  Select the right codec name and expand item.
  </para></step>
<step><para>
  In the entry <systemitem>DisplayName</systemitem> look at the text in
  winged brackets after the backslash and write it down (five dash-delimited
  blocks, the GUID).
  </para></step>
<step><para>
  The codec binary is the file specified in the <systemitem>Filename</systemitem>
  entry.
  </para></step>
</procedure>

<note>
<para>
If there is no <systemitem>Filename</systemitem> and
<systemitem>DisplayName</systemitem> contains something like
<systemitem>device:dmo</systemitem>, then it is a DMO-Codec.
</para>
</note>

<procedure>
<title>Old Method:</title>
<para>
Take a deep breath and start searching the registry...
</para>
<step><para>
  Start <command>regedit</command>.
  </para></step>
<step><para>
  Press <keycap>Ctrl</keycap>+<keycap>F</keycap>, disable the first two
  checkboxes, and enable the third. Type in the fourcc of the codec (e.g.
  <userinput>TM20</userinput>).
  </para></step>
<step><para>
  You should see a field which contains the path and the filename (e.g.
  <filename>C:\WINDOWS\SYSTEM\TM20DEC.AX</filename>).
  </para></step>
<step><para>
  Now that you have the file, we need the GUID. Try searching again, but
  now search for the codec's name, not the fourcc. Its name can be acquired
  when Media Player is playing the file, by checking
  <guimenu>File</guimenu> -&gt; <guisubmenu>Properties</guisubmenu> -&gt;
  <guimenuitem>Advanced</guimenuitem>.
  If not, you are out of luck. Try guessing (e.g. search for TrueMotion).
  </para></step>
<step><para>
  If the GUID is found you should see a <guilabel>FriendlyName</guilabel>
  and a <guilabel>CLSID</guilabel> field. Write down the 16 byte CLSID,
  this is the GUID we need.
  </para></step>
</procedure>

<note>
<para>
If searching fails, try enabling all the checkboxes. You may have
false hits, but you may get lucky...
</para>
</note>

<para>
Now that you have all the necessary information (fourcc, GUID, codec file,
sample AVI), submit your codec support request by mail, and upload these files
to the FTP site:
<systemitem
role="url">ftp://upload.mplayerhq.hu/MPlayer/incoming/[codecname]/
</systemitem>
</para>

<para>
If you want to add a codec yourself, read
<ulink url="http://www.mplayerhq.hu/MPlayer/DOCS/tech/codecs.conf.txt">DOCS/tech/codecs.conf.txt</ulink>.
</para>

</sect2>
</sect1>

</chapter>