[Asterisk-Dev] g723 (probably again...)

[Eric Wieling]

G723.1 requires a license from the patent holder of this codec.

On Tue, 2003-04-29 at 11:24, Michael Graff wrote:
> I'm certain this comes up a lot, but what are the specific issues with g723?
> 
> I found this source online, and am interested in perhaps adding g723 
> support to Asterisk, if this specific codec is useful.
> 
> The files in this directory comprise ANSI-C language reference implementations
> of the CCITT (International Telegraph and Telephone Consultative Committee)
> G.711, G.721 and G.723 voice compressions.  They have been tested on Sun
> SPARCstations and passed 82 out of 84 test vectors published by CCITT
> (Dec. 20, 1988) for G.721 and G.723.  [The two remaining test vectors,
> which the G.721 decoder implementation for u-law samples did not pass,
> may be in error because they are identical to two other vectors for G.723_40.]
> 
> This source code is released by Sun Microsystems, Inc. to the public domain.
> Please give your acknowledgement in product literature if this code is used
> in your product implementation.
> 
> Sun Microsystems supports some CCITT audio formats in Solaris 2.0 system
> software.  However, Sun's implementations have been optimized for higher
> performance on SPARCstations.
> 
> 
> The source files for CCITT conversion routines in this directory are:
> 
>         g72x.h          header file for g721.c, g723_24.c and g723_40.c
>         g711.c          CCITT G.711 u-law and A-law compression
>         g72x.c          common denominator of G.721 and G.723 ADPCM codes
>         g721.c          CCITT G.721 32Kbps ADPCM coder (with g72x.c)
>         g723_24.c       CCITT G.723 24Kbps ADPCM coder (with g72x.c)
>         g723_40.c       CCITT G.723 40Kbps ADPCM coder (with g72x.c)
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