DirectX Audio FAQ
Q: I'm hearing static (white noise) in my sound
buffers sometimes.
A: The debug version of the DirectX runtime fills sound
buffers with static. If you are not filling a buffer before playback is started,
static will be heard.
Q: Playback stops on my DirectSound application when
it looses focus.
A: You need to include the DSBCAPS_GLOBALFOCUS flag in
your DSBUFFERDESC structure when you call the CreateSoundBuffer method.
Q: How do I stream a sound to a DirectSound buffer?
A: One method would be to convert the code in the C++ SDK
sample class called CStreamSound to VB code. (I may post my VB code at a later
date.) This is basically what you need to do: You should create at least two
events in your secondary buffer. For example, set one event halfway through the
buffer and another event at the end. Fill the entire buffer and then start
playing it. When the first event is fired, (half way through the buffer) write
data to the first half of the buffer. When the next event is fired (end of
buffer) write to the second half of the buffer. This keeps your application from
trying to write to the same data in the buffer that the audio card is currently
reading from.
Q: DirectMusic always finds the length of a .WAV file
to be 1, not allowing the start point to be set.
A: With DirectX 8, DirectMusic does not allow you to set
the current play position of a wave file. The current play position can be set
on a wave file played using a DirectSound buffer. The only disadvantage is
DirectSound is not as easy to implement as DirectMusic.
"If we knew what it was we were doing, it would not be called
research, would it?"
- Albert Einstein
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