[speex-dev] ACM Format Tag for Speex Audio

[Keith Looney]

My arrangement for a Speex format tag was actually accidental.  I was asking what would be involved and instead of an answer, I got a format tag.  Since there is only one functional Speex ACM codec available as far as I know, it should use the official format tag.  I will be glad to modify our applications to conform to this de-facto standard.  Others who may develop ACM codecs in the future either have the option of conforming to the WAVEFORMATEX and data layouts as defined for this tag or register a different tag which would be qualified by their company name (for example).

Keith

________________________________________________
Keith Looney
Senior Software Engineer
On2 Technologies, Inc.  The Duck Corporation

<p><p>-----Original Message-----
From: Christian Buchner [mailto:Christian.Buchner1 at epost.de]
Sent: Wednesday, June 18, 2003 12:45 PM
To: speex-dev at xiph.org
Subject: RE: [speex-dev] ACM Format Tag for Speex Audio

<p><p><p>> I have arranged for an official Speex ACM format tag from Microsoft (see
below).  Feel
> free to use this in any ACM codec work.

Hmm, I chose my format tag "randomly" by adding up some ASCII
values. ;) Looking at the registered companies in mmreg.h
I found not one non-profit organization. Hence I thought I
should not even try registering my OpenACM project with
Microsoft.

Erm, so how many ACM codecs for speex are there right now? ;)

One problem with these would be interoperability. If three
different ACM implementations all used the same format tag,
they would most likely not play well with each other.
I have a very specific arrangement in my WAVEFORMATEX header
as well as in the "data" payload of the WAVE file.

Christian

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