README
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- About libdts
- ------------
- libdts is a free library for decoding DTS Coherent Acoustics streams. It is
- released under the terms of the GPL license. The DTS Coherent Acoustics
- standard is used in a variety of applications, including DVD, DTS audio CD and
- radio broadcasting.
- The main goals in libdts development are:
- * Portability - currently all of the code is written in C, and
- when we write platform-specific optimizations we will always
- keep a generic C routine to fall back on.
- * Reuseability - we do not want libdts to include any
- project-specific code, but it should still include enough
- features to be used by very diverse projects.
- * Precision - we do not yet fully support all the core specification of
- the DTS Coherent Acoustics standard (see TODO) so do not expect too
- much of this library for now.
- * Speed - current code is not optimised at all.
- The project homepage is at http://www.videolan.org/dtsdec.html
- dtsdec
- ------
- dtsdec is a test program for libdts. It decodes DTS Coherent Acoustics streams,
- and also includes a demultiplexer for mpeg-1 and mpeg-2 program streams.
- The libdts source code is always distributed in the dtsdec package, to
- make sure it easier for people to test it.
- The basic usage is to just type "dtsdec file" where file is a DTS Coherent
- Acoustics file.
- The "-s" option must be used for multiplexed (audio and video) mpeg-2
- files. These files are usualy found on the internet or on unencrypted
- DVDs.
- The "-o" option is used to select a given output layer. By default
- dtsdec does a stereo downmix and outputs to your speakers, but you can
- try other choices using this option. This is also used for performance
- testing and conformance testing.
- The "-r" option is used to disable the dynamic range compression.
- Other projects using libdts
- ---------------------------
- right now libdts is only being used by VLC media player
- (http://www.videolan.org/) a cross-platform video player and streaming
- solution.
- If you use libdts in another project, let us know !
- Tasks
- -----
- There are several places where we could easily use some help:
- * Testing: If you find any stream that does not decode right
- with libdts, let us know ! The best thing would be to mail to
- the libdts-devel mailing list. Also if you have access to
- encoders, we'd love to get test streams that would be free of
- rights - so that we can put them on this server.
- * Coding: you can have a look in the TODO file first ! The most
- important items are probably to finish implementing the full
- specification and to make sure of the accuracy of the audio output.
- * Porting: If you're porting to a new architecture, you might
- want to experiment with the compile flags defined in
- configure.in . When you figure out whats fastest on your
- platform, send us a patch !
- References
- ----------
- The DTS Coherent Acoustics standard (ETSI 102 114 v1.2.1), as published by the
- ETSI, is available at http://pda.etsi.org/pda/queryform.asp (look for DTS
- Coherent Acoustics)
- SVN repository
- --------------
- The latest libdts and dtsdec source code can always be found by anonymous
- SVN repository:
- # svn co svn://svn.videolan.org/libdts/trunk libdts-trunk
- If you build libdts from SVN you'll have to run ./bootstrap first.
- Support / mailing-lists
- -----------------------
- See the support information at http://www.videolan.org/support/
- libdts-devel
- This is the main mailing list for technical discussion about
- libdts. Anyone wanting to work on libdts, or maybe just stay informed
- about the development process, should probably subscribe to this list.
- Unix build instructions
- -----------------------
- ./configure
- make
- make install
- Building for win32
- ------------------
- There are at least three ways to do it:
- - natively on Windows using Microsoft VC++ and the vc++ project
- included in this distribution.
- - natively on Windows using MSYS + MINGW (www.mingw.org) (MSYS is a
- minimal build environnement to compile unixish projects under
- windows. It provides all the common unix tools like sh, gmake...)
- - or on Linux, using the mingw32 cross-compiler
- Building using MSYS + MINGW on windows
- --------------------------------------
- First you will need to download and install the latest MSYS (version
- 1.0.7 as of now) and MINGW. The installation is really easy. Begin
- with the MSYS auto-installer and once this is done, extract MINGW into
- c:msys1.0mingw. You also have to remember to remove the make
- utility included with MINGW as it conflicts with the one from MSYS
- (just rename or remove c:msys1.0mingwbinmake.exe).
- http://prdownloads.sourceforge.net/mingw/MSYS-1.0.7-i686-2002.04.24-1.exe
- http://prdownloads.sourceforge.net/mingw/MinGW-1.1.tar.gz
- Then you can build the package using:
- # ./configure
- # make
- Building using the mingw32 cross-compiler
- -----------------------------------------
- You need to install mingw32 first. For Debian GNU/Linux users, there
- is a mingw32 package. Otherwise you might get it from the mingw site
- at http://www.mingw.org/download.shtml.
- The videolan project also keeps precompiled mingw32 binaries at
- http://www.videolan.org/vlc/windows.html . If you install these,
- you'll have to set your PATH accordingly to include
- /usr/local/cross-tools/bin too.
- The build should then proceed using something like:
- # CC=i586-mingw32msvc-gcc ./configure --host=i586-mingw32msvc
- # make