source: vbox/trunk/src/libs/libogg-1.3.5/README.md

# Ogg

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Ogg project codecs use the Ogg bitstream format to arrange the raw,
compressed bitstream into a more robust, useful form. For example,
the Ogg bitstream makes seeking, time stamping and error recovery
possible, as well as mixing several sepearate, concurrent media
streams into a single physical bitstream.

## What's here ##
This source distribution includes libogg and nothing else. Other modules
(eg, the modules libvorbis, vorbis-tools for the Vorbis music codec,
libtheora for the Theora video codec) contain the codec libraries for
use with Ogg bitstreams.

Directory:

- `src` The source for libogg, a BSD-license inplementation of the public domain Ogg bitstream format

- `include` Library API headers

- `doc` Ogg specification and libogg API documents

- `win32` Win32 projects and build automation

## Contact ##

The Ogg homepage is located at https://www.xiph.org/ogg/ .
Up to date technical documents, contact information, source code and
pre-built utilities may be found there.

## Building ##

#### Building from tarball distributions ####

    ./configure
    make

and optionally (as root):

    make install

This will install the Ogg libraries (static and shared) into
/usr/local/lib, includes into /usr/local/include and API
documentation into /usr/local/share/doc.

#### Building from repository source ####

A standard svn build should consist of nothing more than:

    ./autogen.sh
    ./configure
    make

and as root if desired :

    make install

#### Building on Windows ####

Use the project file in the win32 directory. It should compile out of the box.

#### Cross-compiling from Linux to Windows ####

It is also possible to cross compile from Linux to windows using the MinGW
cross tools and even to run the test suite under Wine, the Linux/*nix
windows emulator.

On Debian and Ubuntu systems, these cross compiler tools can be installed
by doing:

    sudo apt-get mingw32 mingw32-binutils mingw32-runtime wine

Once these tools are installed its possible to compile and test by
executing the following commands, or something similar depending on
your system:

    ./configure --host=i586-mingw32msvc --target=i586-mingw32msvc --build=i586-linux
    make
    make check

(Build instructions for Ogg codecs such as vorbis are similar and may
be found in those source modules' README files)

## Building with CMake ##

Ogg supports building using [CMake](http://www.cmake.org/). CMake is a meta build system that generates native projects for each platform.
To generate projects just run cmake replacing `YOUR-PROJECT-GENERATOR` with a proper generator from a list [here](http://www.cmake.org/cmake/help/v3.2/manual/cmake-generators.7.html):

    mkdir build
    cd build
    cmake -G YOUR-PROJECT-GENERATOR ..

Note that by default cmake generates projects that will build static libraries.
To generate projects that will build dynamic library use `BUILD_SHARED_LIBS` option like this:

    cmake -G YOUR-PROJECT-GENERATOR -DBUILD_SHARED_LIBS=1 ..

After projects are generated use them as usual

#### Building on Windows ####

Use proper generator for your Visual Studio version like:

    cmake -G "Visual Studio 12 2013" ..

#### Building on Mac OS X ####

Use Xcode generator. To build framework run:

    cmake -G Xcode -DBUILD_FRAMEWORK=1 ..

#### Building on Linux ####

Use Makefile generator which is default one.

    cmake ..
    make

## Testing ##

This package includes a collection of automated tests.
Running them is not part of building nor installation but optional.

### Unix-like System or MinGW ###

If build under automake:

    make check

If build under CMake:

    make test

or:

    ctest

### Windows with MSBuild ###

If build with configuration type "Debug", then:

    ctest -C Debug

If build with configuration type "Release", then:

    ctest -C Release

## License ##

THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.
USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS
GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE
IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.

THE OggVorbis SOURCE CODE IS COPYRIGHT (C) 1994-2019
by the Xiph.Org Foundation https://www.xiph.org/