Re: Bug in XP format conversion for ADPCM

"Jim Keir" <jimkeir@pork.yahoo.co.uk> wrote in message 
news:OZQmXKfhIHA.1208@TK2MSFTNGP05.phx.gbl...
> I believe there's a bug in the XP speech synth package. I've been able to 
> replicate it using the demo code at 
> http://msdn2.microsoft.com/en-us/library/ms717065.aspx .
>
> As it stands it works fine, but if you change the format from 
> SPSF_22kHz16BitMono to any of the ADPCM formats (i.e. 
> SPSF_ADPCM_11kHzMono) it creates a corrupt WAV.

I just tried the sample code with the ADPCM format. I hear static when I try 
to play the resultant file through on a machine with a cheap SB Live 
soundcard.

Then I ran the wave device format enumerator utility that I have here:

http://www.ivrforbeginners.com/downloads/downloads.htm

According to it, my soundcard doesn't support any ADPCM formats.

Do other files recorded in the same format play on your hardware?

Regards,
Will

Hi,

I believe there's a bug in the XP speech synth package. I've been able 
to replicate it using the demo code at 
http://msdn2.microsoft.com/en-us/library/ms717065.aspx .

As it stands it works fine, but if you change the format from 
SPSF_22kHz16BitMono to any of the ADPCM formats (i.e. 
SPSF_ADPCM_11kHzMono) it creates a corrupt WAV.

The 'GSM610', 'TrueSpeech', 'ALaw' and 'uLaw' formats all work as 
expected on both Vista and XP.

Is this a known problem? If so, is there a fix or a workaround?

Cheers,

Hi,

Thanks for the quick reply.

William DePalo [MVP VC++] wrote:
> 
> Do other files recorded in the same format play on your hardware?
> 

Yes, they do. I tried creating the WAV as PCM, then using the standard 
'Sound Recorder' in XP to convert it to ADPCM. That played back. Also, 
ADPCM files recorded in Vista and then played back in XP work. ADPCM 
files generated on XP fail to play back on Vista too. I've also had the 
exact same problem reported by many users of my software, all on XP.

Cheers,
Jim

"Jim Keir" <jimkeir@pork.yahoo.co.uk> wrote in message 
news:OSeLJsfhIHA.4692@TK2MSFTNGP05.phx.gbl...
> Thanks for the quick reply.

You are welcome.

> I've also had the exact same problem reported by many users of my 
> software, all on XP.

Then I'm sorry to say I can't be of much help because my cheap SB-Live 
soundcard doesn't support the format. :-(

I case you don't know, I can tell you that the audio stack saw some major 
updates with Vista (we never had per-app volume control before) so it could 
be an issue of an improvement in Vista rather than a bug in XP. Certainly if 
my format enumerator says that the device natively supports the format it is 
_definitely_ a bug.

Just wondering out loud ...

.. could it be that the Audio Compression Manager

http://msdn2.microsoft.com/en-us/library/aa910365.aspx

is silently and automatically engaged in Vista where it is not in XP?

Regards,
Will