Before you start compiling, make sure that
the glib-2.0 library is installed, as well as the library
popt to parse command line options.
Compilation and installation is as usual:
# tar -xazf agress-0.1.1.tar.gz
# cd agress-0.1.1
# autoreconf -fiv
# ./configure
# make
# make installSee also the file INSTALL
This program allows you to progressively encode audio files.
Progressive ordering of data is very useful in the transmission
streaming audio over the Internet: when the baud rate drops
there will be no buffer emptying and, as a consequence, there will not be
"stuttering" playback, but only temporarily deteriorate the quality.
In addition, progressive ordering allows you to specify exactly
compression ratio: discarding the "tail" of the encoded frame,
will only result in some degradation of the playback quality.
The package includes two programs: agcodec and agplay. As follows from
name, the first is the encoder / decoder, and the second is the player.
The name AGRESS is obtained if you play with the words Audio and
proGRESSive.
Implemented encoder is extremely simple: the source file is divided into frames
(the size of which can be specified on the command line), then to each
the frame uses the Daubechies wavelet transform 9/7, and finally,
SPIHT coding algorithm. Psychoacoustic modeling has not yet
is applied. In other words, this project is rather
demonstrative character.
The encoder supports files of wav format: 8 or 16 bits, stereo or
mono mode, sample rate - any. Play received
agress file can be used with the player agplay, which uses
sound subsystem OSS.
I would be very interested to hear your feedback / opinions / suggestions
about this program and the concept itself in general.
Copyleft (C) 2004, Alexander Simakov
http://www.entropyware.info
xander@entropyware.info