James P. Salsman (bovik@best.com)
Wed, 11 Apr 2001 19:13:23 -0700 (PDT)
Greg and Glenn,
Thanks for posting the minutes so fast this time:
>... Does there need to be a RIFF header or a WAV header on a
> voice segment? .... It was decided that the safe thing to do
> from the sender's point of view is to send a header. Then the
> question was where does the header definition go - in the VPIM
> spec or a different spec?
Wherever it goes, I hope it is specified as a minimal header for
audio/wav;codec=31 (31 hex = 49 decimal -- better use ascii art
with 1s and 0s.)
> It was decided that the way to move forward was to determine the
> codec requirements on the receiver, then fashion the requirements
> for the sender.
If the receiver doesn't understand the audio/wav header, and tries
to play it as raw GSM, it is short enough, but are there alignment
issues; which is to ask: If the audio/wav header is prepended to
the data it encapsulates, can it move the rest of the data out of
codec frame alignment, distorting the audio decoding?
Jutta: Do you know the answer to that question?
> After Glenn presented a slide showing the history of codec selection for VPIM
> v2, VPIM v3, IVM, etc., Glenn took a vote on the following:
>
> What codecs are mandatory to receive/play for IVM?
> 1) MS-GSM packaged in WAV (audio/wav)
> 2) raw G.711 (audio/basic)
> 3) both 1) & 2)
>
> The consensus of the room was for option 3) both, and this proposal will be
> taken to the list for confirmation.
I agree.
Cheers,
James
This archive was generated by hypermail 2.0b3 on Thu Apr 12 2001 - 05:22:32 IDT