README - platform/external/flac - Gitiles

 /* FLAC - Free Lossless Audio Codec
  * Copyright (C) 2001,2002,2003,2004,2005,2006 Josh Coalson
  *
  * This file is part the FLAC project.  FLAC is comprised of several
  * components distributed under difference licenses.  The codec libraries
  * are distributed under Xiph.Org's BSD-like license (see the file
  * COPYING.Xiph in this distribution).  All other programs, libraries, and
  * plugins are distributed under the LGPL or GPL (see COPYING.LGPL and
  * COPYING.GPL).  The documentation is distributed under the Gnu FDL (see
  * COPYING.FDL).  Each file in the FLAC distribution contains at the top the
  * terms under which it may be distributed.
  *
  * Since this particular file is relevant to all components of FLAC,
  * it may be distributed under the Xiph.Org license, which is the least
  * restrictive of those mentioned above.  See the file COPYING.Xiph in this
  * distribution.
  */


 FLAC (http://flac.sourceforge.net/) is an Open Source lossless audio
 codec developed by Josh Coalson.

 FLAC is comprised of
   * `libFLAC', a library which implements reference encoders and
     decoders for native FLAC and Ogg FLAC, and a metadata interface
   * `libFLAC++', a C++ object wrapper library around libFLAC
   * `flac', a command-line program for encoding and decoding files
   * `metaflac', a command-line program for viewing and editing FLAC
     metadata
   * player plugins for XMMS and Winamp
   * user and API documentation

 The libraries (libFLAC, libFLAC++) are
 licensed under Xiph.org's BSD-like license (see COPYING.Xiph).  All other
 programs and plugins are licensed under the GNU General Public License
 (see COPYING.GPL).  The documentation is licensed under the GNU Free
 Documentation License (see COPYING.FDL).


 ===============================================================================
 FLAC - 1.1.3 - Contents
 ===============================================================================

 - Introduction
 - Prerequisites
 - Building in a GNU environment
 - Building with Makefile.lite
 - Building with MSVC
 - Building on Mac OS X
 - Note to embedded developers


 ===============================================================================
 Introduction
 ===============================================================================

 This is the source release for the FLAC project.  See

 	doc/html/index.html

 for full documentation.

 A brief description of the directory tree:

 	doc/          the HTML documentation
 	flac.pbproj/  the Mac OS X Project Builder project
 	include/      public include files for libFLAC and libFLAC++
 	man/          the man page for `flac'
 	src/          the source code and private headers
 	test/         the test scripts


 ===============================================================================
 Prerequisites
 ===============================================================================

 To build FLAC with support for Ogg FLAC you must have built and installed
 libogg according to the specific instructions below.  You must have
 libogg 1.1.2 or greater, or there will be seeking problems with Ogg FLAC.

 If you are building on x86 and want the assembly optimizations, you will
 need to have NASM >= 0.98.30 installed according to the specific instructions
 below.


 ===============================================================================
 Building in a GNU environment
 ===============================================================================

 FLAC uses autoconf and libtool for configuring and building.
 Better documentation for these will be forthcoming, but in
 general, this should work:

 ./configure && make && make check && make install

 The 'make check' step is optional; omit it to skip all the tests,
 which can take several hours and use around 70-80 megs of disk space.
 Even though it will stop with an explicit message on any failure, it
 does print out a lot of stuff so you might want to capture the output
 to a file if you're having a problem.  Also, don't run 'make check'
 as root because it confuses some of the tests.

 NOTE: Despite our best efforts it's entirely possible to have
 problems when using older versions of autoconf, automake, or
 libtool.  If you have the latest versions and still can't get it
 to work, see the next section on Makefile.lite.

 There are a few FLAC-specific arguments you can give to
 `configure':

 --enable-debug : Builds everything with debug symbols and some
 extra (and more verbose) error checking.

 --disable-asm-optimizations : Disables the compilation of the
 assembly routines.  Many routines have assembly versions for
 speed and `configure' is pretty good about knowing what is
 supported, but you can use this option to build only from the
 C sources.

 --enable-sse : If you are building for an x86 CPU that supports
 SSE instructions, you can enable some of the faster routines
 if your operating system also supports SSE instructions.  flac
 can tell if the CPU supports the instructions but currently has
 no way to test if the OS does, so if it does, you must pass
 this argument to configure to use the SSE routines.  If flac
 crashes when built with this option you will have to go back and
 configure without --enable-sse.  Note that
 --disable-asm-optimizations implies --disable-sse.

 --enable-local-xmms-plugin : Installs the FLAC XMMS plugin in
 $HOME/.xmms/Plugins, instead of the global XMMS plugin area
 (usually /usr/lib/xmms/Input).

 --with-ogg=
 --with-xmms-prefix=
 --with-libiconv-prefix=
 Use these if you have these packages but configure can't find them.

 If you want to build completely from scratch (i.e. starting with just
 configure.in and Makefile.am) you should be able to just run 'autogen.sh'
 but make sure and read the comments in that file first.


 ===============================================================================
 Building with Makefile.lite
 ===============================================================================

 There is a more lightweight build system for do-it-yourself-ers.
 It is also useful if configure isn't working, which may be the
 case since lately we've had some problems with different versions
 of automake and libtool.  The Makefile.lite system should work
 on GNU systems with few or no adjustments.

 From the top level just 'make -f Makefile.lite'.  You can
 specify zero or one optional target from 'release', 'debug',
 'test', or 'clean'.  The default is 'release'.  There is no
 'install' target but everything you need will end up in the
 obj/ directory.

 If you are not on an x86 system or you don't have nasm, you
 may have to change the DEFINES in src/libFLAC/Makefile.lite.  If
 you don't have nasm, remove -DFLAC__HAS_NASM.  If your target is
 not an x86, change -DFLAC__CPU_IA32 to -DFLAC__CPU_UNKNOWN.


 ===============================================================================
 Building with MSVC
 ===============================================================================

 There are now .dsp projects and a master FLAC.dsw workspace to build
 all the libraries and executables.

 Prerequisite: you must have the Ogg libraries installed as described
 later.

 Prerequisite: you must have nasm installed, and nasmw.exe must be in
 your PATH, or the path to nasmw.exe must be added to the list of
 directories for executable files in the MSVC global options.

 To build everything, run Developer Studio, do File|Open Workspace,
 and open FLAC.dsw.  Select "Build | Set active configuration..."
 from the menu, then in the dialog, select "All - Win32 Release" (or
 Debug if you prefer).  Click "Ok" then hit F7 to build. This will build
 all libraries both statically (e.g. obj\release\lib\libFLAC_static.lib)
 and as DLLs (e.g.  obj\release\bin\libFLAC.dll), and it will build all
 binaries, statically linked (e.g. obj\release\bin\flac.exe).

 Everything will end up in the "obj" directory.  DLLs and .exe files
 are all that are needed and can be copied to an installation area and
 added to the PATH.  The plugins have to be copied to their appropriate
 place in the player area.  For Winamp2 this is <winamp2-dir>\Plugins.

 By default the code is configured with Ogg support.  Before building FLAC
 you will need to get the Ogg source distribution
 (see http://xiph.org/ogg/vorbis/download/), build ogg_static.lib (load and
 build win32\ogg_static.dsp), copy ogg_static.lib into FLAC's
 'obj\release\lib' directory, and copy the entire include\ogg tree into
 FLAC's 'include' directory (so that there is an 'ogg' directory in FLAC's
 'include' directory with the files ogg.h, os_types.h and config_types.h).


 ===============================================================================
 Building on Mac OS X
 ===============================================================================

 If you have Fink, the GNU flow above should work.  Otherwise,
 there is a Project Builder project in the top-level source
 directory to build libFLAC and the command-line utilities on
 Mac OS X.  In a terminal, cd to the top-level directory (the
 one that contains this README file) and type:

 	pbxbuild -alltargets

 This will create everything and leave it in the build/ directory.
 Don't worry about the rest of the stuff that is in build/ or
 the stuff that was already there before building.

 The Project Builder project requires that you have libiconv and
 libogg in /sw, ala fink.  If you don't, you'll need to install
 them somewhere and change the path to them in the Library Paths
 section of several targets.

 It also assumes the CPU supports Altivec instructions.  If it does
 not, you will also have to add -DFLAC__NO_ASM to the CFLAGS in the
 libFLAC target.

 There currently is no install procedure; you will have to
 manually copy the tools to wherever you need them.


 ===============================================================================
 Note to embedded developers
 ===============================================================================

 libFLAC has grown larger over time as more functionality has been
 included, but much of it may be unnecessary for a particular embedded
 implementation.  Unused parts may be pruned by some simple editing of
 configure.in and src/libFLAC/Makefile.am; the following dependency
 graph shows which modules may be pruned without breaking things
 further down:

 stream_encoder.h
 	stream_decoder.h
 	format.h

 stream_decoder.h
 	format.h

 metadata.h
 	format.h

 In other words, for pure decoding applications, both the stream encoder
 and metadata editing interfaces can be safely removed.

 There is a section dedicated to embedded use in the libFLAC API
 HTML documentation (see doc/html/api/index.html).
	/* FLAC - Free Lossless Audio Codec
	* Copyright (C) 2001,2002,2003,2004,2005,2006 Josh Coalson
	*
	* This file is part the FLAC project. FLAC is comprised of several
	* components distributed under difference licenses. The codec libraries
	* are distributed under Xiph.Org's BSD-like license (see the file
	* COPYING.Xiph in this distribution). All other programs, libraries, and
	* plugins are distributed under the LGPL or GPL (see COPYING.LGPL and
	* COPYING.GPL). The documentation is distributed under the Gnu FDL (see
	* COPYING.FDL). Each file in the FLAC distribution contains at the top the
	* terms under which it may be distributed.
	*
	* Since this particular file is relevant to all components of FLAC,
	* it may be distributed under the Xiph.Org license, which is the least
	* restrictive of those mentioned above. See the file COPYING.Xiph in this
	* distribution.
	*/


	FLAC (http://flac.sourceforge.net/) is an Open Source lossless audio
	codec developed by Josh Coalson.

	FLAC is comprised of
	* `libFLAC', a library which implements reference encoders and
	decoders for native FLAC and Ogg FLAC, and a metadata interface
	* `libFLAC++', a C++ object wrapper library around libFLAC
	* `flac', a command-line program for encoding and decoding files
	* `metaflac', a command-line program for viewing and editing FLAC
	metadata
	* player plugins for XMMS and Winamp
	* user and API documentation

	The libraries (libFLAC, libFLAC++) are
	licensed under Xiph.org's BSD-like license (see COPYING.Xiph). All other
	programs and plugins are licensed under the GNU General Public License
	(see COPYING.GPL). The documentation is licensed under the GNU Free
	Documentation License (see COPYING.FDL).


	===============================================================================
	FLAC - 1.1.3 - Contents
	===============================================================================

	- Introduction
	- Prerequisites
	- Building in a GNU environment
	- Building with Makefile.lite
	- Building with MSVC
	- Building on Mac OS X
	- Note to embedded developers


	===============================================================================
	Introduction
	===============================================================================

	This is the source release for the FLAC project. See

	doc/html/index.html

	for full documentation.

	A brief description of the directory tree:

	doc/ the HTML documentation
	flac.pbproj/ the Mac OS X Project Builder project
	include/ public include files for libFLAC and libFLAC++
	man/ the man page for `flac'
	src/ the source code and private headers
	test/ the test scripts


	===============================================================================
	Prerequisites
	===============================================================================

	To build FLAC with support for Ogg FLAC you must have built and installed
	libogg according to the specific instructions below. You must have
	libogg 1.1.2 or greater, or there will be seeking problems with Ogg FLAC.

	If you are building on x86 and want the assembly optimizations, you will
	need to have NASM >= 0.98.30 installed according to the specific instructions
	below.


	===============================================================================
	Building in a GNU environment
	===============================================================================

	FLAC uses autoconf and libtool for configuring and building.
	Better documentation for these will be forthcoming, but in
	general, this should work:

	./configure && make && make check && make install

	The 'make check' step is optional; omit it to skip all the tests,
	which can take several hours and use around 70-80 megs of disk space.
	Even though it will stop with an explicit message on any failure, it
	does print out a lot of stuff so you might want to capture the output
	to a file if you're having a problem. Also, don't run 'make check'
	as root because it confuses some of the tests.

	NOTE: Despite our best efforts it's entirely possible to have
	problems when using older versions of autoconf, automake, or
	libtool. If you have the latest versions and still can't get it
	to work, see the next section on Makefile.lite.

	There are a few FLAC-specific arguments you can give to
	`configure':

	--enable-debug : Builds everything with debug symbols and some
	extra (and more verbose) error checking.

	--disable-asm-optimizations : Disables the compilation of the
	assembly routines. Many routines have assembly versions for
	speed and `configure' is pretty good about knowing what is
	supported, but you can use this option to build only from the
	C sources.

	--enable-sse : If you are building for an x86 CPU that supports
	SSE instructions, you can enable some of the faster routines
	if your operating system also supports SSE instructions. flac
	can tell if the CPU supports the instructions but currently has
	no way to test if the OS does, so if it does, you must pass
	this argument to configure to use the SSE routines. If flac
	crashes when built with this option you will have to go back and
	configure without --enable-sse. Note that
	--disable-asm-optimizations implies --disable-sse.

	--enable-local-xmms-plugin : Installs the FLAC XMMS plugin in
	$HOME/.xmms/Plugins, instead of the global XMMS plugin area
	(usually /usr/lib/xmms/Input).

	--with-ogg=
	--with-xmms-prefix=
	--with-libiconv-prefix=
	Use these if you have these packages but configure can't find them.

	If you want to build completely from scratch (i.e. starting with just
	configure.in and Makefile.am) you should be able to just run 'autogen.sh'
	but make sure and read the comments in that file first.


	===============================================================================
	Building with Makefile.lite
	===============================================================================

	There is a more lightweight build system for do-it-yourself-ers.
	It is also useful if configure isn't working, which may be the
	case since lately we've had some problems with different versions
	of automake and libtool. The Makefile.lite system should work
	on GNU systems with few or no adjustments.

	From the top level just 'make -f Makefile.lite'. You can
	specify zero or one optional target from 'release', 'debug',
	'test', or 'clean'. The default is 'release'. There is no
	'install' target but everything you need will end up in the
	obj/ directory.

	If you are not on an x86 system or you don't have nasm, you
	may have to change the DEFINES in src/libFLAC/Makefile.lite. If
	you don't have nasm, remove -DFLAC__HAS_NASM. If your target is
	not an x86, change -DFLAC__CPU_IA32 to -DFLAC__CPU_UNKNOWN.


	===============================================================================
	Building with MSVC
	===============================================================================

	There are now .dsp projects and a master FLAC.dsw workspace to build
	all the libraries and executables.

	Prerequisite: you must have the Ogg libraries installed as described
	later.

	Prerequisite: you must have nasm installed, and nasmw.exe must be in
	your PATH, or the path to nasmw.exe must be added to the list of
	directories for executable files in the MSVC global options.

	To build everything, run Developer Studio, do File\|Open Workspace,
	and open FLAC.dsw. Select "Build \| Set active configuration..."
	from the menu, then in the dialog, select "All - Win32 Release" (or
	Debug if you prefer). Click "Ok" then hit F7 to build. This will build
	all libraries both statically (e.g. obj\release\lib\libFLAC_static.lib)
	and as DLLs (e.g. obj\release\bin\libFLAC.dll), and it will build all
	binaries, statically linked (e.g. obj\release\bin\flac.exe).

	Everything will end up in the "obj" directory. DLLs and .exe files
	are all that are needed and can be copied to an installation area and
	added to the PATH. The plugins have to be copied to their appropriate
	place in the player area. For Winamp2 this is <winamp2-dir>\Plugins.

	By default the code is configured with Ogg support. Before building FLAC
	you will need to get the Ogg source distribution
	(see http://xiph.org/ogg/vorbis/download/), build ogg_static.lib (load and
	build win32\ogg_static.dsp), copy ogg_static.lib into FLAC's
	'obj\release\lib' directory, and copy the entire include\ogg tree into
	FLAC's 'include' directory (so that there is an 'ogg' directory in FLAC's
	'include' directory with the files ogg.h, os_types.h and config_types.h).


	===============================================================================
	Building on Mac OS X
	===============================================================================

	If you have Fink, the GNU flow above should work. Otherwise,
	there is a Project Builder project in the top-level source
	directory to build libFLAC and the command-line utilities on
	Mac OS X. In a terminal, cd to the top-level directory (the
	one that contains this README file) and type:

	pbxbuild -alltargets

	This will create everything and leave it in the build/ directory.
	Don't worry about the rest of the stuff that is in build/ or
	the stuff that was already there before building.

	The Project Builder project requires that you have libiconv and
	libogg in /sw, ala fink. If you don't, you'll need to install
	them somewhere and change the path to them in the Library Paths
	section of several targets.

	It also assumes the CPU supports Altivec instructions. If it does
	not, you will also have to add -DFLAC__NO_ASM to the CFLAGS in the
	libFLAC target.

	There currently is no install procedure; you will have to
	manually copy the tools to wherever you need them.


	===============================================================================
	Note to embedded developers
	===============================================================================

	libFLAC has grown larger over time as more functionality has been
	included, but much of it may be unnecessary for a particular embedded
	implementation. Unused parts may be pruned by some simple editing of
	configure.in and src/libFLAC/Makefile.am; the following dependency
	graph shows which modules may be pruned without breaking things
	further down:

	stream_encoder.h
	stream_decoder.h
	format.h

	stream_decoder.h
	format.h

	metadata.h
	format.h

	In other words, for pure decoding applications, both the stream encoder
	and metadata editing interfaces can be safely removed.

	There is a section dedicated to embedded use in the libFLAC API
	HTML documentation (see doc/html/api/index.html).