https://github.com/vmarkovtsev/codec2

codec2 speech codec with some performance optimizations
https://github.com/vmarkovtsev/codec2

Last synced: 22 days ago
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codec2 speech codec with some performance optimizations

• Host: GitHub
• URL: https://github.com/vmarkovtsev/codec2
• Owner: vmarkovtsev
• License: lgpl-2.1
• Created: 2012-11-14T06:44:45.000Z (almost 12 years ago)
• Default Branch: master
• Last Pushed: 2012-11-19T10:42:49.000Z (almost 12 years ago)
• Last Synced: 2023-04-03T10:57:41.928Z (over 1 year ago)
• Language: C
• Size: 4.05 MB
• Stars: 5
• Watchers: 4
• Forks: 5
• Open Issues: 0
• Metadata Files:
  • Readme: README
  • Changelog: ChangeLog
  • License: COPYING

Awesome Lists containing this project

README

        
Codec 2 README

--------------

Codec 2 is an open source (LGPL licensed) speech codec for 2400 bit/s

and below.  For more information please see:

    http://rowetel.com/codec2.html

Also included is a FDMDV modem, see README_fdmdv.txt

Quickstart

----------

1/ Listen to Codec 2:

   $ ./configure && make

   $ cd src

   $ ./c2demo ../raw/hts1a.raw hts1a_c2.raw

   $ ../script/menu.sh ../raw/hts1a.raw hts1a_c2.raw

   NOTE: For playback testing, menu.sh requires either the 'play',

   'aplay' or 'ossplay' programs to be installed (see

   http://sox.sourceforge.net/, http://www.alsa-project.org/, or

   http://www.opensound.com/ respectively).

2/ Compress and Decompress a file:

   $ ./c2enc 2400 ../raw/hts1a.raw hts1a_c2.bit

   $ ./c2dec 2400 hts1a_c2.bit hts1a_c2.raw 

3/ Same thing with pipes:

   $ ./c2enc 1400 ../raw/hts1a.raw - | ./c2dec 1400 - - | play -t raw -r 8000 -s -2 -

Programs

--------

 

1/ c2demo encodes a file of speech samples, then decodes them and

saves the result.

2/ c2enc encodes a file of speech samples to a compressed file of

encoded bits.

3/ c2dec decodes a compressed file of bits to a file of speech

samples.

4/ c2sim is a simulation/development version of Codec 2.  It allows

selective use of the various Codec 2 algorithms.  For example

switching phase modelling or LSP quantisation on and off.

Debugging

---------

1/ For dump file support:

  $ cd codec2

  $ CFLAGS=-DDUMP ./configure

  $ make clean && make

2/ To use gdb:

  $ libtool --mode=execute gdb c2sim

Directories

-----------

  fltk      - FLTK GUI programs(s)

  octave    - Octave scripts used for visualising internal signals 

              during development

  portaudio - Portaudio test programs

  script    - shell scripts for playing and converting raw files

  src       - C source code

  raw       - speech files in raw format (16 bits signed linear 8 kHz)

  unittest  - unit test source code

  voicing   - hand-estimated voicing files, used for development

  wav       - speech files in wave file format

  win32     - Support for building Windows DLL version of Codec 2 and FDMDV libraries

TODO

----

[ ] Get win32/Makefile integrated into Automake system, such that if

    i586-mingw32msvc exists the Win32 code gets automatically built.

[ ] Same for fltk & portaudio, build these conditionally if libs exist