*para_server*
-para_server streams binary audio data (MP3, OGG/Vorbis, 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, 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.
It supports three built-in network streaming protocols
(senders/receivers): HTTP, DCCP, or UDP. This is explained in more
*para_filter*
A filter program that reads from STDIN and writes to STDOUT.
-Like para_recv, this is an atomic building block which can be used
-to assemble higher-level audio receiving facilities. It combines
-several different functionalities in one tool: decoders for multiple
-audio formats (MP3, OGG/Vorbis, AAC, WMA) and a number of processing
-filters, among these a normalizer for audio volume.
+Like para_recv, this is an atomic building block which can be used to
+assemble higher-level audio receiving facilities. It combines several
+different functionalities in one tool: decoders for multiple audio
+formats and a number of processing filters, among these a normalizer
+for audio volume.
*para_afh*
- XREFERENCE(http://www.audiocoding.com/, libfaad). For aac
files (m4a) you'll need libfaad (libfaad-dev).
+ - XREFERENCE(http://www.speex.org/, speex). In order to stream
+ or decode speex files, libspeex (libspeex-dev) is required.
+
- XREFERENCE(ftp://ftp.alsa-project.org/pub/lib/, alsa-lib). On
Linux, you'll need to have ALSA's development package
libasound2-dev installed.
REFERENCE(Requirements, required software) are installed on your
system.
-You don't need everything listed there. In particular, MP3, OGG/Vorbis
-and AAC support are all optional. The configure script will detect
-what is installed on your system and will only try to build those
-executables that can be built with your setup.
+You don't need everything listed there. In particular, MP3, OGG/Vorbis,
+OGG/Speex and AAC support are all optional. The configure script will
+detect what is installed on your system and will only try to build
+those executables that can be built with your setup.
Note that no special decoder library (not even the MP3 decoding library
libmad) is needed for para_server if you only want to stream MP3 or WMA
- The lyrics id which describes the lyrics associated with
this audio file.
- - The audio format id (MP3, OGG, AAC, WMA).
+ - The audio format id (MP3, OGG, ...).
- An amplification value that can be used by the amplification
filter to pre-amplify the decoded audio stream.
Vorbis codec creates variable-bitrate (VBR) data, where the bitrate
may vary considerably.
+*OGG/Speex*
+
+Speex is an open-source speech codec that is based on CELP (Code
+Excited Linear Prediction) coding. It is designed for voice
+over IP applications, has modest complexity and a small memory
+footprint. Wideband and narrowband (telephone quality) speech are
+supported. As for Vorbis audio, Speex bit-streams are often stored
+in OGG files.
+
*AAC*
Advanced Audio Coding (AAC) is a standardized, lossy compression
Chunks and chunk tables
~~~~~~~~~~~~~~~~~~~~~~~
-paraslash uses the word "chunk" as common term for the building
-blocks of an audio file. For MP3 files, a chunk is the same as an
-MP3 frame, while for OGG/Vorbis 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).
+paraslash uses the word "chunk" as common term for the building blocks
+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).
The chunk table contains the offsets within the audio file that
correspond to the chunk boundaries of the file. Like the meta data,
*amp*
-The amp filter which amplifies the audio stream by a fixed scaling
-factor that must be known in advance. For para_audiod this factor is
-derived from the amplification field of the audio file's entry in
-the audio file table while para_filter uses the value given at the
-command line.
+The amp filter amplifies the audio stream by a fixed scaling factor
+that must be known in advance. For para_audiod this factor is derived
+from the amplification field of the audio file's entry in the audio
+file table while para_filter uses the value given at the command line.
The optimal scaling factor F for an audio file is the largest real
number F >= 1 such that after multiplication with F all samples still
projects / paraslash.git / blobdiff