Assuming all Windows . . . Maybe something simplier may be to invent a new
message that the server sends a "play sound" command followed by a "which
sound event to play". The sound on the client side would be played according
to the event number (using maybe PlaySoundEvent function) -or- the event may
be a string (using maybe PlaySound function).
The above is just a thought anyway. It may be able to be expanded to work on
other platforms.
----- Original Message -----
From: "Mac Reiter" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, February 13, 2001 09:01
Subject: Re: Exporting sound with VNC
> Sick and Painful Though-Of-The-Day:
>
> If you can guarantee that the Win32 based server has it's audio recording
> system set up to Record from all output channels, including "Wave Out", I
> have a class that will call a function of your choosing for every N
samples
> of audio data. You could then transmit that over the link back to the
> viewer and pump it into the client's Wave Out to hear everything.
>
> This is a relatively large hammer, since I think all you wanted was
> particular events to transmit sound.
>
> Several problems:
> 1. SLOW - streaming uncompressed audio requires a BIG network pipe.
> 2. Dropouts, jitters, etc - Unless you have guaranteed flowrate between
the
> computers, you'll hear audio dropouts when spikes in network usage
> temporarily block your audio flow.
> 3. Some programs on the server will refuse to open because they can't grab
> the audio device (because it is being used to record local audio)
>
> I have done this for a project at work, so I'm not sure if I can give away
> any of the code, but if you really want to try it, most of the tricky bit
> came from a recent edition of Charles Petzold's "Programming Windows".
>
> Also, if you look in the windows SDK documentation, you should be able to
> find documentation on audio codecs (COmpressor/DECompressors), which will
> substantially decrease the network load of the audio stream, potentially
> even making it possible to use over a modem.
>
> http://msdn.microsoft.com/library
>
> You want the Platform SDK, Multimedia, and look around.
>
> OH, and if you do it, don't just send every audio packet you receive.
Most
> of the time the computer won't be making any sound, so you would just be
> wasting bandwidth transmitting a flat wave. When each audio packet comes
> in, see what the largest deflection from centerline is, and only transmit
> it if it exceeds some value.
>
> OH (again), this also means that you could hear what was going on in the
> server room, if the server is equipped with a microphone...
>
> Mac
>
> At 04:35 PM 2/13/01 +0900, you wrote:
> >Hi everyone,
> >
> >I am interested to export/regenerate sound at the client machine whenever
a
> >new message window appear on the server machine. Is there anyone tried to
> >go in this direction with VNC or I am the first one. Also if anyone could
> >guide/update me with his knowledge to have this functionality then it
will
> >be a great help. It will give me a kick start instead of inventing the
> >wheel again. Feel free to send e-mail to me at [EMAIL PROTECTED]
> >
> >Best Regards
> >
> >Saeed Khan
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> >to [EMAIL PROTECTED]
> >See also: http://www.uk.research.att.com/vnc/intouch.html
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