Question on wavs

[Todd Wasson]

I found this in the forums for playing wav files. I was thrilled to hear a Cobra Mustang doing a burnout while my bitmapped tachometer climbed crazily through 8000 rpm! (with help from Perfect Sync's Grafix Tools. Love it)

SUB PlayWave(BYVAL File$)
LOCAL zWav AS ASCIIZ * 256
zWav = File$
CALL PlaySound(zWav, BYVAL NULL%, %SND_ASYNC)
END SUB

Anybody know how to let a wav file play, but in the middle of it, suddenly change the sampling rate without starting the wav over again? Would love to take a 2 or 3 second sound clip of an engine at a constant speed and change the sampling rate repeatedly while it's playing, to make the tone gradually change up and down. Is this possible? Flightsim 98 does this, I think. I'm new to the wav thing, so please, be gentle!
Praying hard, Todd
P.S. Would Charles Petzold's book have answers to this kind of thing?




[This message has been edited by Todd Wasson (edited February 04, 2000).]

[Lance Edmonds]

To accomplish this, you'll probably need to access the low-level multimedia API's directly, such as the MCIxxxxxx API's. Check out MSDN http://msdn.microsoft.com and search for "Win32 Multimedia Programmer's Reference" or related phrases.



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Lance
PowerBASIC Support
mailto:[email protected][email protected]</A>

[Clay Clear]

I've been looking through the forums myself to find code for playing
MP3's/WAV's. My questions are: when using MCISendString() and
PlaySound(), is there any way to stop them from playing the sound
files before they're at the end of the files? Will both functions
play both MP3's and WAV's?

I run a TriBBS 11.3 BBS system (16-bit DOS-based system), and
for sysops running multinode setups under a multitasker (i.e.,
32-bit Windows), I want to write a 32-bit EXE that will be a
replacement for the sysop pager, and I want it to include the
ability to play MP3's/WAV's for the sysop notification alert.
Well, the sysops who use my program would probably be VERY
annoyed if a whole 3- or 4-minute song played, when the normal
sysop pager alert is 30 seconds in duration. 'Course, I *could*
say in my docs to make SURE that the source sound files are no
longer than 30 seconds in duration. But, still, I'd like to
have the option.


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[Clay Clear]

Disregard my last reply. I found most of the answers I needed by
looking through the other topics on the subject. The answers I
didn't find, I'm sure I can figure out myself via empirical
testing.


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[Lance Edmonds]

The sndPlaySound() API provides a way to halt playback... check it out at http://msdn.microsoft.com

From memory, it goes somthing like:

CALL SndPlaySound(BYVAL %NULL, %NULL)

Note that the sound would need to have been asynchronously played with the %SND_ASYNC parameter. http://msdn.microsoft.com/library/wc...r/uif_s_57.htm

MciSendString also provides a STOP clause if I remember correctly. Search the BBS for "mcisendstring" and you should locate some discussions on this.


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Lance
PowerBASIC Support
mailto:[email protected][email protected]</A>

[Peter Stephensen]

todd --

you can find what you want in petzold. you have to play the wav
the hard way (using the waveout-api). for an example of wavout
see forums/forum7/html/000446.html.
i think i have an example of playing a wav-file (the hard way) somewhere.
please mail me if you want me to look for it.

regards
peter

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[Vladimir Shulakov]

Hi,
Todd,Try the unlimited opportunities =dsound= (DirectSound).

-- Vladimir

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[Todd Wasson]

Vladimir and Peter,

I abandoned the sound issues quite some time ago and have
been developing a more complex physics engine for video game/simulation
use. When the time is right for my own sim, FastGraph and DirectX
may be the way to go. I've been reading up on DirectX and it doesn't seem
quite the monster many folks have made it out to be, but of course,
I haven't written anything with it yet. That'll have to be a
VC++ thing (I'm MUCH better with PowerBasic, so that puts things in
perspective). I do have DirectDraw for PowerBasic and have played
a bit with that, but I don't know anybody that has converted the
DirectSound, Direct3D, etc., headers to PowerBasic yet. Perhaps
FastGraph 6.0 includes this? For now, I'm going with no sound and
wrote a GUI based wireframe 3-D engine to test with. DirectSound
will be my route eventually, although it would be nice to know how
the low level functions work also.

Getting closer...

Thanks,
Todd Wasson
Performance Simulations
Drag Racing and Top Speed Prediction Software http://PerformanceSimulations.Com

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[This message has been edited by Todd Wasson (edited August 17, 2000).]