🚀 go-pugleaf

In article <4803@sumax.seattleu.edu>, chauhand@sumax.seattleu.edu (Digvijay Chauhan ) writes:
> From: swix@prism.gatech.edu (SWIX,SCOTT R)
>
> The OS/2 Multimedia Extensions (MMPM/2) provide audio capabilities
> including digital audio capture  & playback, as well as line audio
> channel control, volume, bass, etc.
>
> The digital audio interface is via either a string-based language
> or a message based protocol.  Other devices, such as videodisc
> players, MIDI, etc are similarly controlled.

Sounds very similar to the Windows Media Control Interface. But this is
just a way of using a PC as a control centre for external hardware, not
for getting digital audio/video data in and out of the PC.

Can you actually get a stream of digital data from the OS/2 Multimedia
Extensions, or send one to them? Do the Extensions support anything else
besides audio?

Lawrence D'Oliveiro                       fone: +64-7-856-2889
Computer Services Dept                     fax: +64-7-838-4066
University of Waikato            electric mail: ldo@waikato.ac.nz
Hamilton, New Zealand    37^ 47' 26" S, 175^ 19' 7" E, GMT+12:00
"Good points: Strong on features. Bad points: Cluttered by features.
Conclusion: A good buy, especially if you like lots of features."
		       -- PCW review of Pro Write Plus, Sept 1991

Lawrence D'Oliveiro writes:
>Sounds very similar to the Windows Media Control Interface. But this is
>just a way of using a PC as a control centre for external hardware, not
>for getting digital audio/video data in and out of the PC.

Correct. MMPM has a similar MCI layer, but they have gone a few steps
further to take advantage of the multitasking environment.

>Can you actually get a stream of digital data from the OS/2 Multimedia
>Extensions, or send one to them?

Yes, one of the steps I mentioned is the Sync/Stream Manager and the
set of APIs to this layer. This layer manages an extensible group of
stream manager DLLs to manage data streaming to or from devices.
Each stream handler can simultaneously handle multiple instances
of any data protocol that it supports. This is fully architected
so you can write your own stream handlers and define new data streaming
protocols. In all, this layer adds a level of data streaming and
event synchronization support that Windoze doesn't come close to
matching.

> Do the Extensions support anything else besides audio?
Yes!
- 1.0 supports videodisc and CDXA.
- In 4Q this year, MCI support for digital video with support for
  ActionMedia II (DVI).
- Later this year, MCI support for display and capture of analog
  video with support for M-Motion.
- 1.1 due out 1st half of 93 is MCI support for software-compressed
  motion video.
Keep tuned for more!
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                                          dcthomas@vnet.ibm.com
Dave Thomas           "ikken hitatsu"     phone: (919) 543-2897
                                          Disclaimer: My views, not IBM's
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