AGRESS = Audio + proGRESSive

Compiling and Installing

 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 install

See also the file INSTALL

Program description

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.

Feedback

 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
[email protected]

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