Date: Fri, 28 Jul 1995 10:58:22 +0200 From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: hasty@rah.star-gate.com, multimedia@rah.stargate.com, hackers@freebsd.org Subject: C source for Rockwell ADPCM decompression available Message-ID: <199507280858.KAA04113@labinfo.iet.unipi.it>
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[I hope this is of interest to hackers] After a few days of work, I managed to make an initial port to C of the Rockwell conversion routines from their ADPCM format to Ulaw and other formats. My work is based on the sources publicly released from Rockwell earlier this year, and is intended to help those willing to use Rockwell-based voice modems in a Unix environment. The program, as it stands, has lot of limitations WRT the original code. Besides, I might have introduced some bugs in the translation process. Still, better than nothing... For those interested, the code is available from ftp://ftp.iet.unipi.it/~pub/rockwell/d2.c the original source from rockwell (d.asm) is in the same directory; I also recommend that you have a look at the Rockwell page, http://www.nb.rockwell.com/ref/adpcm.html Any feedback on my code is more than welcome. I'd be delighted if someone from Rockwell could have a look at the code. In particular, I am wondering why the same file sounds much better when played on the modem than when it is converted with either my program or the original DMAIN.EXE from rockwell. Cheers Luigi -- ==================================================================== Luigi Rizzo Dip. di Ingegneria dell'Informazione email: luigi@iet.unipi.it Universita' di Pisa tel: +39-50-568533 via Diotisalvi 2, 56126 PISA (Italy) fax: +39-50-568522 http://www.iet.unipi.it/~luigi/ ====================================================================
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