Adding Sound - Game Development with SlimDX - page 96

Note
Remember that the using block will automatically dispose of our WaveStream
when program execution reaches the end of the using block, and that using
blocks only work like this with types that implement the IDisposable interface.
The first four lines of code inside the using block set up our audio buffer. The first
one creates the AudioBuffer object. The second line sets the buffer's AudioData
property to our WaveStream object to get the audio data from the .wav file and into
our audio buffer. The third line sets the buffer's AudioBytes property to the length
of the .wav file, so the buffer knows how much data we have shoved into it.
The next line of code tells XAudio2 that we want to loop this sound. This is done
by setting the LoopCount property to XAudio2.LoopInfinite . The LoopCount
property sets how many times we want to loop the sound. You can set the start po-
sition for the loop and the end position via the AudioBuffer 's BeginLoop and
EndLoop properties. This is not necessary if your audio file already has looping data
in it. In this case these properties are already set for us based on the data from the
file. Note that the AudioBuffer class also has the PlayBegin and PlayLength
properties that let you set the portion of the sound that you wish to play. These prop-
erties are set to the beginning and end of the sound file by default.
Note
The BufferFlags enumeration wejust usedisnot the sameoneweusedwhen
wewereworkingwithDirectSound. TheDirectSound enumeration forbuffer flags
is SlimDX.DirectSound.BufferFlags , while the XAudio2 enumeration for
buffer flags is SlimDX.XAudio2.BufferFlags .
The last three lines of code set up our SourceVoice object. This object is used to
submit our audio data to the MasteringVoice object so that we can play it. So, the
first of these three lines creates the SourceVoice object. The second line submits
the audio data from our AudioBuffer , so that we can play it, and the last line plays
our sound.