Silverlight 5 beta新特性探索系列:6.Silverlight 5新增低延迟声音效果类SoundEffect.支持wav音乐格式【附带源码实例】

< Grid x:Name = " LayoutRoot " Background = " White " >
<!-- 准备3个Silder控件以控制音乐效果 -->
< Slider Height = " 135 " HorizontalAlignment = " Left " Margin = " 62,38,0,0 "
Name = " SlVolume " VerticalAlignment = " Top " Width = " 62 "
Orientation = " Vertical " Maximum = " 1 " Value = " 0.5 " />
< Slider Height = " 135 " HorizontalAlignment = " Left " Margin = " 162,38,0,0 "
Name = " SlPitch " VerticalAlignment = " Top " Width = " 62 "
Orientation = " Vertical " Value = " 0 " Maximum = " 1 " Minimum = " -1 " />
< Slider Height = " 135 " HorizontalAlignment = " Left " Margin = " 262,38,0,0 "
Name = " SlPan " VerticalAlignment = " Top " Width = " 62 "
Orientation = " Vertical " Value = " 0 " Maximum = " 1 " Minimum = " -1 " />
<!-- 显示名称 -->
< TextBlock Height = " 23 " HorizontalAlignment = " Left " Margin = " 71,179,0,0 "
Name = " textBlock1 " Text = " 音量调节 " VerticalAlignment = " Top " />
< TextBlock Height = " 23 " HorizontalAlignment = " Left " Margin = " 166,179,0,0 "
Name = " textBlock2 " Text = " 高低音调节 " VerticalAlignment = " Top " />
< TextBlock Height = " 23 " HorizontalAlignment = " Left " Margin = " 271,179,0,0 "
Name = " textBlock3 " Text = " 声道平衡 " VerticalAlignment = " Top " />
</ Grid >

public MainPage()
{
InitializeComponent();
// 第一步：加载相应的事件
Loaded += new RoutedEventHandler(MainPage_Loaded);
this .SlVolume.ValueChanged +=
new RoutedPropertyChangedEventHandler < double > (SlVolume_ValueChanged);
this .SlPitch.ValueChanged +=
new RoutedPropertyChangedEventHandler < double > (SlPitch_ValueChanged);
this .SlPan.ValueChanged +=
new RoutedPropertyChangedEventHandler < double > (SlPan_ValueChanged);
}

void MainPage_Loaded( object sender, RoutedEventArgs e)
{
GetSound();
}
SoundEffect _soundEffect;
SoundEffectInstance instance;
public void GetSound()
{
// 第二步：加载声音WAV文件
var laserStream =
Application.GetResourceStream( new Uri( " zhizu.wav " , UriKind.RelativeOrAbsolute));
_soundEffect = SoundEffect.FromStream(laserStream.Stream);

// 第三步：设置声音文件初始化播放属性
instance = _soundEffect.CreateInstance();

// Pitch变调效果属性，是高低音平衡调节，该值在-1到1之间设置
instance.Pitch = 0.0f ;

// Pan声像调节属性，它用于调节该路声源在空间的分布图像。
instance.Pan = 0.0f ;

// Volume属性是音量大小调节，该值范围是0-1
instance.Volume = 0.5f ;
instance.Play();
}

private void SlVolume_ValueChanged( object sender,
RoutedPropertyChangedEventArgs < double > e)
{
// 第四步：调节声音属性
instance.Volume = float .Parse(e.NewValue.ToString());
this .textBlock1.Text = " 音量调节 " + e.NewValue.ToString();
}

private void SlPitch_ValueChanged( object sender,
RoutedPropertyChangedEventArgs < double > e)
{
// 第四步：调节声音属性
instance.Pitch = float .Parse(e.NewValue.ToString());
this .textBlock2.Text = " 高低音调节 " + e.NewValue.ToString();
}

private void SlPan_ValueChanged( object sender,
RoutedPropertyChangedEventArgs < double > e)
{
// 第四步：调节声音属性
instance.Pan = float .Parse(e.NewValue.ToString());
this .textBlock3.Text = " 声像调节 " + e.NewValue.ToString();
}

SoundEffectInstance.Pitch
// Pitch变调效果属性，是高低音平衡调节，该值在-1到1之间设置
// 当往-1调节时，即往低音调调节
// 当往+1调节时，即往高音调调节
// 如果是0则正常音高

 

SoundEffectInstance.Volume
// Volume属性是音量大小调节，该值范围是0-1