*para_server*
-para_server streams binary audio data (MP3, OGG/Vorbis, OGG/Speex,
-M4A, WMA files) over local and/or remote networks. It listens on a
-TCP port and accepts commands such as play, stop, pause, next from
-authenticated clients. There are many more commands though, see the
-man page of para_server for a description of all commands.
+para_server streams binary audio data (MP3, ...) over local and/or
+remote networks. It listens on a TCP port and accepts commands such
+as play, stop, pause, next from authenticated clients. There are
+many more commands though, see the man page of para_server for a
+description of all commands.
It supports three built-in network streaming protocols
(senders/receivers): HTTP, DCCP, or UDP. This is explained in more
with a symmetric RC4 session key. For each user of paraslash you must
create a public/secret RSA key pair for authentication.
+If para_client is started without non-option arguments, an interactive
+session (shell) is started. Command history and command completion are
+supported through libreadline.
*para_audiod*
The client program which talks to para_audiod. Used to control
para_audiod, to receive status info, or to grab the stream at any
-point of the decoding process.
+point of the decoding process. Like para_client, para_audioc supports
+interactive sessions on systems with libreadline.
*para_recv*
A command line HTTP/DCCP/UDP stream grabber. The http mode is
compatible with arbitrary HTTP streaming sources (e.g. icecast).
+In addition to the three network streaming modes, para_recv can also
+operate in local (afh) mode. In this mode it writes the content of
+an audio file on the local file system in complete chunks to stdout,
+optionally 'just in time'. This allows to cut an audio file without
+first decoding it, and it enables third-party software which is unaware
+of the particular audio format to send complete frames in real time.
*para_filter*
A small stand-alone program that prints tech info about the given
audio file to STDOUT. It can be instructed to print a "chunk table",
-an array of offsets within the audio file or to write the content of
-the audio file in complete chunks 'just in time'.
-
-This allows third-party streaming software that is unaware of the
-particular audio format to send complete frames in real time.
+an array of offsets within the audio file.
*para_write*
coreaudio (Mac OS). para_write can also be used as a stand-alone WAV
or raw audio player.
+*para_play*
+
+A command line audio player.
*para_gui*
*para_fade*
-An (OSS-only) alarm clock and volume-fader.
+An alarm clock and volume-fader for OSS and ALSA.
-----------
Quick start
Requirements
~~~~~~~~~~~~
+For the impatient:
+
+ git clone git://git.tuebingen.mpg.de/osl
+ cd osl && make && sudo make install && sudo ldconfig
+ sudo apt-get install autoconf libssl-dev help2man gengetopt \
+ libmad0-dev libid3tag0-dev libasound2-dev libvorbis-dev \
+ libfaad-dev libspeex-dev libFLAC-dev libsamplerate-dev \
+ libasound2-dev libao-dev libreadline-dev libncurses-dev
-In any case you'll need
+Detailed description: In any case you'll need
- XREFERENCE(http://systemlinux.org/~maan/osl/, libosl).
The _object storage layer_ library is used by para_server. To
scripts which run during compilation require the EMPH(Bourne
again shell). It is most likely already installed.
+ - XREFERENCE(ftp://ftp.gnu.org/pub/gnu/gengetopt/, gengetopt)
+ is needed to generate the C code for the command line parsers
+ of all paraslash executables.
+
+ - XREFERENCE(ftp://ftp.gnu.org/pub/gnu/help2man, help2man)
+ is used to create the man pages.
+
+Optional:
+
- XREFERENCE(http://www.openssl.org/, openssl) or
XREFERENCE(ftp://ftp.gnupg.org/gcrypt/libgcrypt/, libgcrypt).
At least one of these two libraries is needed as the backend
distro, but you might have to install the development package
(libssl-dev or libgcrypt-dev on debian systems) as well.
- - XREFERENCE(ftp://ftp.gnu.org/pub/gnu/help2man, help2man)
- is used to create the man pages.
-
-Optional:
-
- XREFERENCE(http://www.underbit.com/products/mad/, libmad).
To compile in MP3 support for paraslash, the development
package must be installed. It is called libmad0-dev on
- XREFERENCE(http://www.speex.org/, speex). In order to stream
or decode speex files, libspeex (libspeex-dev) is required.
+ - XREFERENCE(http://flac.sourceforge.net/, flac). To stream
+ or decode files encoded with the _Free Lossless Audio Codec_,
+ libFLAC (libFLAC-dev) must be installed.
+
+ - XREFERENCE(http://www.mega-nerd.com/SRC/index.html,
+ libsamplerate). The resample filter will only be compiled if
+ this library is installed. Debian package: libsamplerate-dev.
+
- XREFERENCE(ftp://ftp.alsa-project.org/pub/lib/, alsa-lib). On
Linux, you'll need to have ALSA's development package
libasound2-dev installed.
libao). Needed to build the ao writer (ESD, PulseAudio,...).
Debian package: libao-dev.
+ - XREFERENCE(ftp://ftp.gnu.org/pub/gnu/ncurses, curses). Needed
+ for para_gui. Debian package: libncurses-dev.
+
+ - XREFERENCE(http://cnswww.cns.cwru.edu/php/chet/readline/rltop.html,
+ GNU Readline). If this library (libreadline-dev) is installed,
+ para_client, para_audioc and para_play support interactive
+ sessions.
+
Installation
~~~~~~~~~~~~
files. Also, it's fine to use para_server on a box without sound card.
Next, install the paraslash package on all machines, you'd like this
-software to run on:
+software to run on. If you compile from a released tarball, execute
(./configure && make) > /dev/null
+When compiling from git or from snapshots downloaded via gitweb,
+the above command will not work because the configure script is not
+included in the git repository. In this case the following command
+should be used instead:
+
+ ./autogen.sh
+
+This runs autoconf to generate the configure script, then runs it as
+above. Therefore you'll need autoconf for this to work.
+
There should be no errors but probably some warnings about missing
packages which usually implies that not all audio formats will be
supported. If headers or libs are installed at unusual locations you
sudo chown $LOGNAME /var/paraslash
-Alternatively, use the --afs_socket Option to specify a different
+Alternatively, use the --afs-socket Option to specify a different
location for the AFS command socket.
For this first try, we'll use the info loglevel to make the output
called the public key and the private key. A message can be encrypted
with either key and only the counterpart of that key can decrypt
the message. While RSA can be used for both signing and encrypting
-a message, paraslash only uses RSA only for the latter purpose. The
+a message, paraslash uses RSA only for the latter purpose. The
RSA public key encryption and signatures algorithms are defined in
detail in RFC 2437.
At startup para_server reads the user list file which contains one
line per user. The default location of the user list file may be
-changed with the --user_list option.
+changed with the --user-list option.
There should be at least one user in this file. Each user must have
an RSA key pair. The public part of the key is needed by para_server
allow para_audiod to obtain the Unix credentials of the connecting
process.
-Use para_audiod's --user_allow option to allow connections only for
+Use para_audiod's --user-allow option to allow connections only for
a limited set of users.
-----------------------
is composed of superframes, each containing one or more frames of
2048 samples. For 16 bit stereo a WMA superframe is about 8K large.
+*FLAC*
+
+The Free Lossless Audio Codec (FLAC) compresses audio without quality
+loss. It gives better compression ratios than a general purpose
+compressor like zip or bzip2 because FLAC is designed specifically
+for audio. A FLAC-encoded file consits of frames of varying size, up
+to 16K. Each frame starts with a header that contains all information
+necessary to decode the frame.
+
Meta data
~~~~~~~~~
32 characters long. ID3, version 2 is much more flexible but requires
a separate library being installed for paraslash to support it.
-Ogg vorbis files contain meta data as Vorbis comments, which are
-typically implemented as strings of the form "[TAG]=[VALUE]". Unlike
-ID3 version 1 tags, one may use whichever tags are appropriate for
-the content.
+Ogg vorbis, ogg speex and flac files contain meta data as Vorbis
+comments, which are typically implemented as strings of the form
+"[TAG]=[VALUE]". Unlike ID3 version 1 tags, one may use whichever
+tags are appropriate for the content.
AAC files usually use the MPEG-4 container format for storing meta
data while WMA files wrap meta data as special objects within the
of an audio file. For MP3 files, a chunk is the same as an MP3 frame,
while for OGG files a chunk is an OGG page, etc. Therefore the chunk
size varies considerably between audio formats, from a few hundred
-bytes (MP3) up to 8K (WMA).
+bytes (MP3) up to 16K (FLAC).
The chunk table contains the offsets within the audio file that
correspond to the chunk boundaries of the file. Like the meta data,
para_audioc -- stat -p
-is executed, but this can be customized via the --stat_cmd option. In
+is executed, but this can be customized via the --stat-cmd option. In
particular it possible to use
para_client -- stat -p
paraslash development. It is necessary for cloning the git repository
and for getting updates.
-ftp://ftp.gnu.org/pub/gnu/gengetopt/ (gengetopt). The C code for
-the command line parsers of all paraslash executables is generated
-by gengetopt. The generated C files are shipped in the tarballs but
-are not contained in the git repository.
-
ftp://ftp.gnu.org/pub/gnu/m4/ (m4). Some input files for gengetopt
are generated from templates by the m4 macro processor.
projects / paraslash.git / blobdiff