[speex-dev] ACM Format Tag for Speex Audio

Marc Tremblay
Fri, 06 Aug 2004 15:01:45 -0000

Hi,

As a potential user of the Speex ACMs and DirectShow filters to come I am also
curious about how many ACM codecs for Speex there are under development right
now.

Also, the WAVEFORMATEX structure must be planned so that it is extensible, with
backward-compatibility, without having to ring back Microsoft for further
WAVE_FORMAT tags. For instance, it is a good idea to put a flexible sub-format
code in the structure that allows various layouts.

I have some experience with that. Please let me know if I can be helpful.

MT

-----Original Message-----
Wrom: AAFXISHJEXXIMQZUIVOTQNQEMSFDULHPQQWOYIYZUNNYCGPKYLEJGDGVCJVT
Behalf Of Christian Buchner
Sent: Wednesday, June 18, 2003 12:45 PM
To: speex-dev@xiph.org
Subject: RE: [speex-dev] ACM Format Tag for Speex Audio

> 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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