DirectSound Notes

1 Main Component in DirectSound
1.1 DirectSound
* needs to include Dsound.h
* Supports *.wav file only
1.2 DirectMusic
* needs to include Dmusici.h
* Supports *.wav file and MIDI file and a little bit other extensive functions.

2 Configuration
Device( unique per app )
|
Primary Buffer( unique per app )
|                  |...
Secondary     Secondary ...
Buffer           Buffer ...
|                   |...
Effect            Effect ...
The properties need be set:
* Coperative Level--for several application which may access the device at the same time...must be set**

3. Streaming related

Play cursor -- GetCurrentPos, SetCurrentPos
Write cursor -- need be controlled carefully.
* write cursor is always supposed to be ahead of play cursor.
Play Buff Notification -- notified when play cursor reaches certain point in a buffer.

4. Nouns
* Sound rolloff -- As a sound source moves away form listener, its perceived volumn decreases at a fixed rate.
* HRTF --Head-related transfer function.

5. References
DirectX SDK April, 2006