Commit 5e5fc016 authored by Josh Coalson's avatar Josh Coalson
Browse files

reorganized doc directory

parent ceacff2b
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# flac - Command-line FLAC encoder/decoder
# Copyright (C) 2002 Josh Coalson
#
# 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 2
# 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
AUTOMAKE_OPTIONS = foreign
SUBDIRS = . html
FLAC.tag: Doxyfile
doxygen Doxyfile
rm -rf html/api
mv doxytmp/html html/api
rm -rf doxytmp
docdir = $(datadir)/doc/$(PACKAGE)-$(VERSION)
doc_DATA = \
FLAC.tag
EXTRA_DIST = Doxyfile $(doc_DATA)
# FLAC - Free Lossless Audio Codec
# Copyright (C) 2001,2002 Josh Coalson
#
# This program is part of FLAC; 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 2
# 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
AUTOMAKE_OPTIONS = foreign
SUBDIRS = ru images
docdir = $(datadir)/doc/$(PACKAGE)-$(VERSION)/html
doc_DATA = \
comparison.html \
developers.html \
documentation.html \
download.html \
features.html \
format.html \
goals.html \
id.html \
index.html \
news.html \
api
EXTRA_DIST = $(doc_DATA)
This diff is collapsed.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- Copyright (c) 2000,2001,2002 Josh Coalson -->
<!-- Permission is granted to copy, distribute and/or modify this document -->
<!-- under the terms of the GNU Free Documentation License, Version 1.1 -->
<!-- or any later version published by the Free Software Foundation; -->
<!-- with no invariant sections. -->
<!-- A copy of the license can be found at http://www.gnu.org/copyleft/fdl.html -->
<HTML>
<HEAD>
<TITLE>FLAC - developers</TITLE>
</HEAD>
<BODY MARGINWIDTH="0" MARGINHEIGHT="0" LEFTMARGIN="0" RIGHTMARGIN="0" TOPMARGIN="0" BGCOLOR="#99CC99" TEXT="#000000" LINK="#336699" VLINK="#336699" ALINK="#336699">
<TABLE BORDER=0 WIDTH="100%" CELLPADDING=1 CELLSPACING=0>
<TR>
<TD ALIGN="CENTER" BGCOLOR="#000000"><A HREF="http://flac.sourceforge.net/"><IMG SRC="images/logo.jpg" ALIGN=CENTER ALT="FLAC Logo" BORDER=0 HSPACE=0></a></TD>
</TR>
</TABLE>
<TABLE WIDTH="100%" CELLPADDING="0" CELLSPACING="0" BORDER="0"><TR BGCOLOR="#99CC99"><TD><IMG SRC="images/1x1.gif" WIDTH="1" HEIGHT="25" ALT=""></TD></TR></TABLE>
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<TABLE WIDTH="100%" CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR>
<TD ALIGN="CENTER" BGCOLOR="#D3D4C5">
<TABLE CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR>
<TD HEIGHT=22 BGCOLOR="#D3D4C5" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;<A CLASS="topnav" HREF="index.html">home</A>&nbsp;&nbsp;</TD><TD BGCOLOR="#D3D4C5" ALIGN=CENTER>|</TD>
<TD BGCOLOR="#D3D4C5" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;<A CLASS="topnav" HREF="news.html">news</A>&nbsp;&nbsp;</TD><TD BGCOLOR="#D3D4C5" ALIGN=CENTER>|</TD>
<TD BGCOLOR="#D3D4C5" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;<A CLASS="topnav" HREF="download.html">download</A>&nbsp;&nbsp;</TD><TD BGCOLOR="#D3D4C5" ALIGN=CENTER>|</TD>
<TD BGCOLOR="#D3D4C5" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;<A CLASS="topnav" HREF="features.html">features</A>&nbsp;&nbsp;</TD><TD BGCOLOR="#D3D4C5" ALIGN=CENTER>|</TD>
<TD BGCOLOR="#D3D4C5" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;<A CLASS="topnav" HREF="goals.html">goals</A>&nbsp;&nbsp;</TD><TD BGCOLOR="#D3D4C5" ALIGN=CENTER>|</TD>
<TD BGCOLOR="#D3D4C5" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;<A CLASS="topnav" HREF="format.html">format</A>&nbsp;&nbsp;</TD><TD BGCOLOR="#D3D4C5" ALIGN=CENTER>|</TD>
<TD BGCOLOR="#D3D4C5" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;<A CLASS="topnav" HREF="id.html">id</A>&nbsp;&nbsp;</TD><TD BGCOLOR="#D3D4C5" ALIGN=CENTER>|</TD>
<TD BGCOLOR="#D3D4C5" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;<A CLASS="topnav" HREF="comparison.html">comparison</A>&nbsp;&nbsp;</TD><TD BGCOLOR="#D3D4C5" ALIGN=CENTER>|</TD>
<TD BGCOLOR="#D3D4C5" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;<A CLASS="topnav" HREF="documentation.html">documentation</A>&nbsp;&nbsp;</TD><TD BGCOLOR="#D3D4C5" ALIGN=CENTER>|</TD>
<TD BGCOLOR="#D3D4C5" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;developers&nbsp;&nbsp;</TD>
</TR>
</TABLE>
</TD>
</TR>
</TABLE>
<TABLE WIDTH="100%" CELLPADDING="0" CELLSPACING="0" BORDER="0"><TR BGCOLOR="#000000"><TD><IMG SRC="images/1x1.gif" WIDTH="1" HEIGHT="2" ALT=""></TD></TR></TABLE>
<TABLE WIDTH="100%" CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR>
<TD ALIGN="CENTER" BGCOLOR="#EEEED4">
<TABLE CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR>
<TD HEIGHT=22 BGCOLOR="#EEEED4" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;english&nbsp;&nbsp;</TD><TD BGCOLOR="#EEEED4" ALIGN=CENTER>|</TD>
<TD BGCOLOR="#EEEED4" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;<A CLASS="topnav" HREF="ru/developers.html">russian</A>&nbsp;&nbsp;</TD>
</TR>
</TABLE>
</TD>
</TR>
</TABLE>
<TABLE WIDTH="100%" CELLPADDING="0" CELLSPACING="0" BORDER="0"><TR BGCOLOR="#000000"><TD><IMG SRC="images/1x1.gif" WIDTH="1" HEIGHT="2" ALT=""></TD></TR></TABLE>
<CENTER>
<TABLE WIDTH="100%" CELLPADDING="0" CELLSPACING="0" BORDER="0"><TR BGCOLOR="#99CC99"><TD><IMG SRC="images/1x1.gif" WIDTH="1" HEIGHT="15" ALT=""></TD></TR></TABLE>
<TABLE WIDTH="100%" CELLPADDING="5" CELLSPACING="5" BORDER="0">
<TR><TD>
<TABLE WIDTH="100%" CELLPADDING="0" CELLSPACING="0" BORDER="0"><TR BGCOLOR="#000000"><TD><IMG SRC="images/1x1.gif" WIDTH="1" HEIGHT="1" ALT=""></TD></TR></TABLE>
<TABLE CELLSPACING="0" CELLPADDING="3" WIDTH="100%" BORDER="0" BGCOLOR="#D3D4C5">
<TR><TD><FONT FACE="Lucida,Verdana,Helvetica,Arial">
<B><FONT SIZE="+2">FLAC developers</FONT></B>
</FONT></TD></TR>
</TABLE>
<TABLE WIDTH="100%" CELLPADDING="0" CELLSPACING="0" BORDER="0"><TR BGCOLOR="#000000"><TD><IMG SRC="images/1x1.gif" WIDTH="1" HEIGHT="1" ALT=""></TD></TR></TABLE>
<TABLE CELLSPACING="0" CELLPADDING="3" WIDTH="100%" BORDER="0" BGCOLOR="#EEEED4">
<TR><TD><FONT FACE="Lucida,Verdana,Helvetica,Arial">
<P>
FLAC is an open source project and we are happy to enlist the help of anyone who wants to contribute. You can do this to a limited extent through the <A HREF="http://sourceforge.net/mail/?group_id=13478">mailing list</A> but if you have major changes to make to the code it's best to <A HREF="http://sourceforge.net/project/memberlist.php?group_id=13478">sign up as a developer</A>. In either case, make sure to check out the <A HREF="goals.html">FLAC goals</A> first; there are some thing the we <B>don't</B> want added to FLAC, like copy protection and lossy compression.
</P>
<P>
High priority items are:
</P>
<P>
<UL>
<LI>
More input plugins. Currently there are plugins for XMMS and Winamp; Freeamp is in the works. More is better!
</LI>
<LI>
Improving the compression methods.
</LI>
</UL>
</P>
<P>
Some other "nice-to-haves":
</P>
<P>
<UL>
<LI>
Fix the MSVC makefiles to make libFLAC.dll (instead of just the .lib).
</LI>
<LI>
Configurable ID3V1 support and ID3V2 support in the plugins.
</LI>
<LI>
Support more input types than just WAVE and raw in <TT><B>flac</B></TT>.
</LI>
<LI>
A better logo! Gimp jedi I'm not...
</LI>
</UL>
</P>
<P>
Things that are in the works (check the flac-dev mailing list):
</P>
<P>
<UL>
<LI>
Windows ACM codec.
</LI>
<LI>
FLAC module for <A HREF="http://oss.sgi.com/projects/audiofile/">Audiofile</A>.
</LI>
</UL>
</P>
</FONT>
</TD></TR>
</TABLE>
<TABLE WIDTH="100%" CELLPADDING="0" CELLSPACING="0" BORDER="0"><TR BGCOLOR="#000000"><TD><IMG SRC="images/1x1.gif" WIDTH="1" HEIGHT="1" ALT=""></TD></TR></TABLE>
</TD></TR>
</TABLE>
<TABLE WIDTH="100%" CELLPADDING="5" CELLSPACING="5" BORDER="0">
<TR><TD>
<TABLE WIDTH="100%" CELLPADDING="0" CELLSPACING="0" BORDER="0"><TR BGCOLOR="#000000"><TD><IMG SRC="images/1x1.gif" WIDTH="1" HEIGHT="1" ALT=""></TD></TR></TABLE>
<TABLE CELLSPACING="0" CELLPADDING="3" WIDTH="100%" BORDER="0" BGCOLOR="#D3D4C5">
<TR><TD><FONT FACE="Lucida,Verdana,Helvetica,Arial">
<B><FONT SIZE="+2">third-party developers</FONT></B>
</FONT></TD></TR>
</TABLE>
<TABLE WIDTH="100%" CELLPADDING="0" CELLSPACING="0" BORDER="0"><TR BGCOLOR="#000000"><TD><IMG SRC="images/1x1.gif" WIDTH="1" HEIGHT="1" ALT=""></TD></TR></TABLE>
<TABLE CELLSPACING="0" CELLPADDING="3" WIDTH="100%" BORDER="0" BGCOLOR="#EEEED4">
<TR><TD><FONT FACE="Lucida,Verdana,Helvetica,Arial">
<P>
FLAC is open to third-party developers who want to add support for FLAC into their programs. All the necessary functionality is contained the library libFLAC which is licensed under the <A HREF="http://www.gnu.org/copyleft/lesser.html">LGPL</A>. The relevant documentation here is:
<UL>
<LI>The <A HREF="documentation.html#libflac">libFLAC API documentation</A> and <A HREF="documentation.html#libflacpp">libFLAC++ API documentation</A></LI>
<LI>The <A HREF="format.html">formal description</A> of the FLAC format.</LI>
<LI>The <A HREF="id.html">ID registration page</A> for registering an ID if you need to write custom metadata.</LI>
</UL>
</P>
<P>
There also are several examples in the FLAC code base of the use of libFLAC and libFLAC++ that may also be helpful. Visit the <A HREF="download.html">download page</A> for instructions on how to get the source.
</P>
</FONT>
</TD></TR>
</TABLE>
<TABLE WIDTH="100%" CELLPADDING="0" CELLSPACING="0" BORDER="0"><TR BGCOLOR="#000000"><TD><IMG SRC="images/1x1.gif" WIDTH="1" HEIGHT="1" ALT=""></TD></TR></TABLE>
</TD></TR>
</TABLE>
</CENTER>
<P>&nbsp;Copyright (c) 2000,2001,2002 Josh Coalson</P>
</BODY>
</HTML>
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- Copyright (c) 2000,2001,2002 Josh Coalson -->
<!-- Permission is granted to copy, distribute and/or modify this document -->
<!-- under the terms of the GNU Free Documentation License, Version 1.1 -->
<!-- or any later version published by the Free Software Foundation; -->
<!-- with no invariant sections. -->
<!-- A copy of the license can be found at http://www.gnu.org/copyleft/fdl.html -->
<HTML>
<HEAD>
<TITLE>FLAC - download</TITLE>
</HEAD>
<BODY MARGINWIDTH="0" MARGINHEIGHT="0" LEFTMARGIN="0" RIGHTMARGIN="0" TOPMARGIN="0" BGCOLOR="#99CC99" TEXT="#000000" LINK="#336699" VLINK="#336699" ALINK="#336699">
<TABLE BORDER=0 WIDTH="100%" CELLPADDING=1 CELLSPACING=0>
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<TD ALIGN="CENTER" BGCOLOR="#000000"><A HREF="http://flac.sourceforge.net/"><IMG SRC="images/logo.jpg" ALIGN=CENTER ALT="FLAC Logo" BORDER=0 HSPACE=0></a></TD>
</TR>
</TABLE>
<TABLE WIDTH="100%" CELLPADDING="0" CELLSPACING="0" BORDER="0"><TR BGCOLOR="#99CC99"><TD><IMG SRC="images/1x1.gif" WIDTH="1" HEIGHT="25" ALT=""></TD></TR></TABLE>
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<TD BGCOLOR="#D3D4C5" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;download&nbsp;&nbsp;</TD><TD BGCOLOR="#D3D4C5" ALIGN=CENTER>|</TD>
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<TD BGCOLOR="#D3D4C5" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;<A CLASS="topnav" HREF="format.html">format</A>&nbsp;&nbsp;</TD><TD BGCOLOR="#D3D4C5" ALIGN=CENTER>|</TD>
<TD BGCOLOR="#D3D4C5" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;<A CLASS="topnav" HREF="id.html">id</A>&nbsp;&nbsp;</TD><TD BGCOLOR="#D3D4C5" ALIGN=CENTER>|</TD>
<TD BGCOLOR="#D3D4C5" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;<A CLASS="topnav" HREF="comparison.html">comparison</A>&nbsp;&nbsp;</TD><TD BGCOLOR="#D3D4C5" ALIGN=CENTER>|</TD>
<TD BGCOLOR="#D3D4C5" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;<A CLASS="topnav" HREF="documentation.html">documentation</A>&nbsp;&nbsp;</TD><TD BGCOLOR="#D3D4C5" ALIGN=CENTER>|</TD>
<TD BGCOLOR="#D3D4C5" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;<A CLASS="topnav" HREF="developers.html">developers</A>&nbsp;&nbsp;</TD>
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<TABLE CELLPADDING=0 CELLSPACING=0 BORDER=0>
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<TD HEIGHT=22 BGCOLOR="#EEEED4" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;english&nbsp;&nbsp;</TD><TD BGCOLOR="#EEEED4" ALIGN=CENTER>|</TD>
<TD BGCOLOR="#EEEED4" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;<A CLASS="topnav" HREF="ru/download.html">russian</A>&nbsp;&nbsp;</TD>
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<CENTER>
<TABLE WIDTH="100%" CELLPADDING="0" CELLSPACING="0" BORDER="0"><TR BGCOLOR="#99CC99"><TD><IMG SRC="images/1x1.gif" WIDTH="1" HEIGHT="15" ALT=""></TD></TR></TABLE>
<TABLE WIDTH="100%" CELLPADDING="5" CELLSPACING="5" BORDER="0">
<TR><TD>
<TABLE WIDTH="100%" CELLPADDING="0" CELLSPACING="0" BORDER="0"><TR BGCOLOR="#000000"><TD><IMG SRC="images/1x1.gif" WIDTH="1" HEIGHT="1" ALT=""></TD></TR></TABLE>
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<TR><TD><FONT FACE="Lucida,Verdana,Helvetica,Arial">
<B><FONT SIZE="+2">download</FONT></B>
</FONT></TD></TR>
</TABLE>
<TABLE WIDTH="100%" CELLPADDING="0" CELLSPACING="0" BORDER="0"><TR BGCOLOR="#000000"><TD><IMG SRC="images/1x1.gif" WIDTH="1" HEIGHT="1" ALT=""></TD></TR></TABLE>
<TABLE CELLSPACING="0" CELLPADDING="3" WIDTH="100%" BORDER="0" BGCOLOR="#EEEED4">
<TR><TD><FONT FACE="Lucida,Verdana,Helvetica,Arial">
<P>
Currently all releases are made through SourceForge and can be found <A HREF="http://sourceforge.net/project/showfiles.php?group_id=13478">here</A>. For each version there is a source release and binary releases for Linux, Windows, Solaris, and Darwin (includes OS X).
</P>
<P>
Debian packages can be found <A HREF="http://packages.debian.org/cgi-bin/search_packages.pl?keywords=flac+libflac+1.0&searchon=all&subword=1&version=all&release=all">here</A>.
</P>
<P>
You can also get the nightly CVS tarball <A HREF="http://cvs.sourceforge.net/cvstarballs/flac-cvsroot.tar.gz">here</A>.
</P>
</FONT>
</TD></TR>
</TABLE>
<TABLE WIDTH="100%" CELLPADDING="0" CELLSPACING="0" BORDER="0"><TR BGCOLOR="#000000"><TD><IMG SRC="images/1x1.gif" WIDTH="1" HEIGHT="1" ALT=""></TD></TR></TABLE>
</TD></TR>
</TABLE>
<TABLE WIDTH="100%" CELLPADDING="5" CELLSPACING="5" BORDER="0">
<TR><TD>
<TABLE WIDTH="100%" CELLPADDING="0" CELLSPACING="0" BORDER="0"><TR BGCOLOR="#000000"><TD><IMG SRC="images/1x1.gif" WIDTH="1" HEIGHT="1" ALT=""></TD></TR></TABLE>
<TABLE CELLSPACING="0" CELLPADDING="3" WIDTH="100%" BORDER="0" BGCOLOR="#D3D4C5">
<TR><TD><FONT FACE="Lucida,Verdana,Helvetica,Arial">
<B><FONT SIZE="+2">extras</FONT></B>
</FONT></TD></TR>
</TABLE>
<TABLE WIDTH="100%" CELLPADDING="0" CELLSPACING="0" BORDER="0"><TR BGCOLOR="#000000"><TD><IMG SRC="images/1x1.gif" WIDTH="1" HEIGHT="1" ALT=""></TD></TR></TABLE>
<TABLE CELLSPACING="0" CELLPADDING="3" WIDTH="100%" BORDER="0" BGCOLOR="#EEEED4">
<TR><TD><FONT FACE="Lucida,Verdana,Helvetica,Arial">
<P>
<B>GUI front-ends:</B>
<P>
<UL>
<LI>
<B>Windows</B>
<UL>
<LI><A HREF="http://home.wanadoo.nl/~w.speek/flac.htm">FLAC frontend</A>, a Windows GUI.</LI>
<LI><A HREF="http://www.inf.ufpr.br/~rja00/lossless.html">FLACdrop</A>, an Oggdrop-like frontend for Windows.</LI>
<LI><A HREF="http://www.monkeysaudio.com/">Monkey's Audio</A> can be fooled into supporting FLAC as an external encoder; <A HREF="documentation.html#monkey">here's how</A>.</LI>
</UL>
</LI>
<LI>
<B>Unix</B>
<UL>
<LI><A HREF="http://www.nostatic.org/grip/">Grip</A> is a great ripping and encoding front end and can be easily configured to use flac.</LI>
</UL>
</LI>
</UL>
</P>
</FONT>
</TD></TR>
</TABLE>
<TABLE WIDTH="100%" CELLPADDING="0" CELLSPACING="0" BORDER="0"><TR BGCOLOR="#000000"><TD><IMG SRC="images/1x1.gif" WIDTH="1" HEIGHT="1" ALT=""></TD></TR></TABLE>
</TD></TR>
</TABLE>
</CENTER>
<P>&nbsp;Copyright (c) 2000,2001,2002 Josh Coalson</P>
</BODY>
</HTML>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- Copyright (c) 2000,2001,2002 Josh Coalson -->
<!-- Permission is granted to copy, distribute and/or modify this document -->
<!-- under the terms of the GNU Free Documentation License, Version 1.1 -->
<!-- or any later version published by the Free Software Foundation; -->
<!-- with no invariant sections. -->
<!-- A copy of the license can be found at http://www.gnu.org/copyleft/fdl.html -->
<HTML>
<HEAD>
<TITLE>FLAC - features</TITLE>
</HEAD>
<BODY MARGINWIDTH="0" MARGINHEIGHT="0" LEFTMARGIN="0" RIGHTMARGIN="0" TOPMARGIN="0" BGCOLOR="#99CC99" TEXT="#000000" LINK="#336699" VLINK="#336699" ALINK="#336699">
<TABLE BORDER=0 WIDTH="100%" CELLPADDING=1 CELLSPACING=0>
<TR>
<TD ALIGN="CENTER" BGCOLOR="#000000"><A HREF="http://flac.sourceforge.net/"><IMG SRC="images/logo.jpg" ALIGN=CENTER ALT="FLAC Logo" BORDER=0 HSPACE=0></a></TD>
</TR>
</TABLE>
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<TR>
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<TABLE CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR>
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<TD BGCOLOR="#D3D4C5" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;<A CLASS="topnav" HREF="download.html">download</A>&nbsp;&nbsp;</TD><TD BGCOLOR="#D3D4C5" ALIGN=CENTER>|</TD>
<TD BGCOLOR="#D3D4C5" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;features&nbsp;&nbsp;</TD><TD BGCOLOR="#D3D4C5" ALIGN=CENTER>|</TD>
<TD BGCOLOR="#D3D4C5" ALIGN=CENTER NOWRAP>&nbsp;&nbsp;<A CLASS="topnav" HREF="goals.html">goals</A>&nbsp;&nbsp;</TD><TD BGCOLOR="#D3D4C5" ALIGN=CENTER>|</TD>
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<B><FONT SIZE="+2">features</FONT></B>
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<P>
FLAC stands for Free Lossless Audio Codec. The FLAC project consists of:
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<LI>the stream format</LI>
<LI><B><TT>libFLAC</TT></B>, a library of reference encoders and decoders, and a metadata interface</LI>
<LI><B><TT>libFLAC++</TT></B>, an object wrapper around libFLAC</LI>
<LI><B><TT>flac</TT></B>, a command-line wrapper around libFLAC to encode and decode .flac files</LI>
<LI><B><TT>metaflac</TT></B>, a command-line metadata editor for .flac files</LI>
<LI>input plugins for various music players (Winamp, XMMS, and more in the works)</LI>
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<P>
"Free" means that the specification of the stream format is in the public domain (the FLAC project reserves the right to set the FLAC specification and certify compliance), and that neither the FLAC format nor any of the implemented encoding/decoding methods are covered by any patent. It also means that the sources for <B><TT>libFLAC</TT></B> and <B><TT>libFLAC++</TT></B> are available under the <A HREF="http://www.opensource.org/licenses/lgpl-license.html">LGPL</A> and the sources for <B><TT>flac</TT></B>, <B><TT>metaflac</TT></B>, and the plugins are available under the <A HREF="http://www.opensource.org/licenses/gpl-license.html">GPL</A>.
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FLAC compiles on many platforms: most Unixes (Linux, *BSD, Solaris, OS X), Windows, BeOS, and OS/2. There are build systems for autoconf/automake, MSVC, Watcom C, and Project Builder.
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What FLAC is:
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<P><LI>
FLAC is patent free. The FLAC format or encoding/decoding methods are not covered by any patents.
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<P><LI>
FLAC is lossless. The encoding of PCM data incurs no loss of information, and the decoded audio is bit-for-bit identical to what went into the encoder. Each frame contains a 16-bit CRC of the frame data for detecting transmission errors. The integrity of the audio data is further insured by storing an <A HREF="http://userpages.umbc.edu/~mabzug1/cs/md5/md5.html">MD5 signature</A> of the original unencoded audio data in the file header, which can be compared against later during decoding or testing.
</LI></P>
<P><LI>
FLAC is designed to compress audio data. Technically, <B><TT>flac</TT></B> can "compress" other kinds of data losslessly (if you pass it in as a mono 8-bit raw file), but the output files tend to be bigger.
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<P><LI>
The compression capabilities of FLAC are extendable, meaning that new methods can be added to future versions of the format without breaking older streams or decoders.
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<P><LI>
The currently implemented compression methods in the reference encoder yield streams smaller than shorten. The encoding time is variable, but is generally between that of <A HREF="http://www.softsound.com/Shorten.html">shorten</A>, and that of, say, <A HREF="http://www.mp3dev.org/mp3/">LAME</A>. The most aggressive compression however can be quite slow. For more info see the <A HREF="comparison.html">comparison page</A>.
</LI></P>
<P><LI>
FLAC is asymmetric in favor of decode speed. Decoding requires only integer arithmetic, and is much less compute-intensive than for most perceptual codecs. Real-time decode performance is easily achievable on even modest hardare.
</LI></P>
<P><LI>
FLAC is suitable for archiving, since there is no information loss. You are not locked into the format since there is no generation loss if you decide to convert your data to another format in the future. In addition to the frame CRCs and MD5 signature, <B><TT>flac</TT></B> has a verify option that decodes the encoded stream in parallel with the encoding process and compares the result to the original, aborting with an error if there is a mismatch.
</LI></P>
<P><LI>
FLAC is suitable for streaming. Each FLAC frame contains enough data to decode that frame. FLAC does not even rely on previous or following frames. FLAC uses sync codes and CRCs (similar to MPEG and other formats), which, along with framing, allow decoders to pick up in the middle of a stream with a minimum of delay.
</LI></P>
<P><LI>
FLAC supports fast sample-accurate seeking. Not only is this useful for playback, it makes FLAC files suitable for use in editing applications.
</LI></P>
<P><LI>
FLAC has an extendable metadata system. New metadata blocks can be defined and implemented in future versions of FLAC without breaking older streams or decoders. Applications can write their own <A HREF="format.html#def_APPLICATION">APPLICATION</A> metadata once they <A HREF="id.html">register an ID</A>. ID3 and ID3V2 tags may be attached to .flac files without disrupting the decoder.
</LI></P>
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<P>
Some things that follow from the features:
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<P><LI>
FLAC streams can be played back consecutively with no audible gaps in between, unlike say, MP3s (this is one of the minor <A HREF="goals.html">goals</A>). For example, you can encode a live album as individual tracks and still play them back seamlessly.
</LI></P>
<P><LI>
The sample-accurate seeking allows versatile playback: a sophisticated player could do index points, complex looping, or other structured playback. This could be useful in for say DJs, or practice sessions where you want to play along through specific passages.
</LI></P>
<P><LI>
Basically, you get the versatility of a WAV file in a compressed streamable format.
</LI></P>
</UL>
<P>
What FLAC is <B>not</B>:
</P>
<UL>
<P><LI>
Lossy. FLAC is intended for lossless compression only, as there are many good lossy formats already, such as <A HREF="http://www.mp3-tech.org/">MP3</A> (see <A HREF="http://www.mp3dev.org/mp3/">LAME</A> for an excellent open-source implementation), and <A HREF="http://www.xiph.org/ogg/vorbis/index.html">Ogg Vorbis</A>.
</LI></P>
<P><LI>
SDMI compliant, et cetera. There is no intention to support any methods of copy protection, which are, for all practical purposes, a complete waste of bits. (Another way to look at it is that since copy protection is futile, it really carries no information, so you might say FLAC already losslessly compresses all possible copy protection information down to zero bits!) Of course, we can't stop what some misguided person does with proprietary meta-data blocks, but then again, non-proprietary decoders will skip them anyway.
</LI></P>
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<P>&nbsp;Copyright (c) 2000,2001,2002 Josh Coalson</P>
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