/* FLAC - Free Lossless Audio Codec
 * Copyright (C) 2001-2009  Josh Coalson
 * Copyright (C) 2011-2022  Xiph.Org Foundation
 *
 * This file is part the FLAC project.  FLAC is comprised of several
 * components distributed under different 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 is an Open Source lossless audio codec developed by Josh Coalson from 2001
to 2009. From 2012 to 2021 it was maintained by Erik de Castro Lopo. It continues
to be maintained by various volunteers under the auspices of the Xiph.org Foundation.

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 plugin for XMMS
  * 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 - 1.3.4 - Contents
===============================================================================

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


===============================================================================
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
	examples/     example programs demonstrating the use of libFLAC and libFLAC++
	include/      public include files for libFLAC and libFLAC++
	man/          the man pages for `flac' and `metaflac'
	src/          the source code and private headers
	test/         the test scripts

If you have questions about building FLAC that this document does not answer,
please submit them at the following tracker so this document can be improved:

	https://sourceforge.net/p/flac/support-requests/


===============================================================================
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.


===============================================================================
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.ac and src/libFLAC/Makefile.am; the following dependency
graph shows which modules may be pruned without breaking things
further down:

metadata.h
	stream_decoder.h
	format.h

stream_encoder.h
	stream_decoder.h
	format.h

stream_decoder.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).

Also, there are several places in the libFLAC code with comments marked
with "OPT:" where a #define can be changed to enable code that might be
faster on a specific platform.  Experimenting with these can yield faster
binaries.


===============================================================================
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.  May be necessary for building on OS X (Intel).

--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.ac 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 Microsoft Visual Studio
===============================================================================

FLAC used to provide Visual Studio specific build files, but as this was rather
hard to maintain, CMake has replaced these files. See Building with CMake for
more information.

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

If you have Fink or a recent version of OS X with the proper autotools,
the GNU flow above should work.


===============================================================================
Building with CMake
===============================================================================

CMake is a cross-platform build system. FLAC can be built on Windows, Linux, Mac
OS X using CMake.

You can use either CMake's CLI or GUI. We recommend you to have a separate build
folder outside the repository in order to not spoil it with generated files. It is
possible however to do a so-called in-tree build, in that case /path/to/flac-build
in the following examples is equal to /path/to/flac-source.

CLI
---
   Go to your build folder and run something like this:

   /path/to/flac-build$ cmake /path/to/flac-source

   or e.g. in Windows shell

   C:\path\to\flac-build> cmake \path\to\flac-source
   (provided that cmake is in your %PATH% variable)

   That will generate build scripts for the default build system (e.g. Makefiles
   for UNIX). After that you start build with a command like this:

   /path/to/flac-build$ make

   And afterwards you can run tests or install the built libraries and headers

   /path/to/flac-build$ make test
   /path/to/flac-build$ make install

   If you want use a build system other than default add -G flag to cmake, e.g.:

   /path/to/flac-build$ cmake /path/to/flac-source -GNinja
   /path/to/flac-build$ ninja

   or:

   /path/to/flac-build$ cmake /path/to/flac-source -GXcode

   Use cmake --help to see the list of available generators.

   By default CMake will search for OGG. If CMake fails to find it you can help
   CMake by specifying the exact path:

   /path/to/flac-build$ cmake /path/to/flac-source -DOGG_ROOT=/path/to/ogg
   
   If you would like CMake to build OGG alongside FLAC, you can place the ogg
   sources directly in the flac source directory as a subdirectory with the name
   ogg, for example 
   
   /path/to/flac-source/ogg

   If you don't want to build flac with OGG support you can tell CMake not to
   look for OGG:

   /path/to/flac-build$ cmake /path/to/flac-source -DWITH_OGG=OFF

   Other FLAC's options (e.g. building C++ lib or docs) can also be put to cmake
   through -D flag.

GUI
---
   It is likely that you would prefer to use the CMake GUI if you use Visual
   Studio to build FLAC. It's in essence the same process as building using CLI.

   Open cmake-gui. In the window select a source directory (the repository's
   root), a build directory (some other directory outside the repository). Then
   press button "Configure". CMake will ask you which build system you prefer.
   Choose that version of Visual Studio which you have on your system, choose
   whether you want to build for Win32 or x64. Press OK. After CMake finishes
   you can change the configuration to your liking and if you change anything,
   run Configure again. With the "Generate" button, CMake creates Visual Studio
   files, which can be opened from Visual Studio. With the button "Open Project"
   CMake will launch Visual Studio and open the generated solution. You can use
   the project files as usual but remember that they were generated by CMake.
   That means that your changes (e.g. some additional compile flags) will be
   lost when you run CMake next time.

   CMake searches by default for OGG on your system and returns an error if it
   cannot find it. If you want to build OGG alongside FLAC, you can download the
   OGG sources and extract them in a subdirectory of the FLAC source directory 
   with the name ogg (i.e. /path/to/flac-source/ogg) before running CMake. If
   you don't want to build FLAC with OGG support, untick the box following
   WITH_OGG flag in the list of variables in cmake-gui window and run
   "Configure" again.

   If CMake fails to find MSVC compiler then running cmake-gui from MS Developer
   comand prompt should help.