I need to play last 20 seconds of audio file. I try to specify Position
property of myMediaPlayer
, but there is a problem. Because I try to play LAST seconds of file I cannot set Position
property of audio file like this:
myMediaPlayer.Position = new TimeSpan(0, 0, 20);
I need to set Position
property like this
myMediaPlayer.Position = new TimeSpan(0, 0, DURATION_OF_FILE - 20);
Computing of audio file duration is the problem. Firstly, I don't know duration of file, therefore I try to compute it in MediaOpened
event handler.
void MediaOpened(object sender, System.Windows.RoutedEventArgs e)
{
_duration = myMediaElement.NaturalDuration.TimeSpan;
}
To invoke MediaOpened
I need to start play audio file, so I am enforced to write in constructor:
// Just for MediaOpened call
myMediaElement.Play();
// I need not playing file right here, so I stop playing immediately
myMediaElement.Stop();
Now duration is computed and all seems to be good. But after that fake play-stop operations myMediaPlayer
ignores Position
property! Audio file is always opened from the beginning, from the first second whatever Position
is set.
How can it be solved?
XAML:
<StackPanel>
<MediaElement Name="myMediaElement"
LoadedBehavior="Manual"/>
<Button Click="SeekToMediaPosition">Click</Button>
</StackPanel>
.cs
TimeSpan _duration;
public MainWindow()
{
InitializeComponent();
myMediaElement.Source = new Uri("D:/VS_Projects/WpfApplication1/WpfApplication1/Resources/Audio.mp3");
myMediaElement.MediaOpened += new System.Windows.RoutedEventHandler(MediaOpened);
myMediaElement.Play();
myMediaElement.Stop();
}
void MediaOpened(object sender, System.Windows.RoutedEventArgs e)
{
_duration = myMediaElement.NaturalDuration.TimeSpan;
}
private void SeekToMediaPosition(object sender, RoutedEventArgs args)
{
var test = (Int32)Math.Truncate(_duration.TotalSeconds) - 20;
TimeSpan ts = new TimeSpan(0, 0, test);
myMediaElement.Position = ts;
myMediaElement.Play();
}
Add UnloadedBehavior="Manual" to the media element. Hope it works
Instead of doing myMediaElement.Stop();
, do myMediaElement.Pause();
.
Doing Stop()
resets the player and does not allow you to set the Position
. Goofy, I know, but that's how it works.
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