My silverlight code:
var stream = TitleContainer.OpenStream("Giggle.wav");
var effect = SoundEffect.FromStream(stream);
FrameworkDispatcher.Update();
effect.Play();
The file, Giggle.wav plays multiple times. I expected the code would wait while the "Play" method executes.
Suggestions to make it play one instance at a time?
Thanks
How about DynamicSoundEffectInstance? Play your sound and when BufferNeeded event occurs - play next one. I am not sure but I think I saw another way how to play a sound synchronously. When I will find I will let you know.
Related
I have an app that emits sounds at a random interval. When two sounds collide they do not nicely overplay each other but one interrupts the other.
I'm using SoundPlayer to play the sounds. (this is a WPF app)
How can I use multiple sound channels so that if two sounds occur at the same time they are both played at the same time instead of one interrupting the other?
To my knowledge SoundPlayer uses the native PlaySound function which does not support playing multiple sound simultaneously.
You can however do this with System.Windows.Media.MediaPlayer.
var p1 = new MediaPlayer();
p1.Open(new Uri(#"C:\windows\media\ringout.wav"));
p1.Play();
System.Threading.Thread.Sleep(250);
var p2 = new MediaPlayer();
p2.Open(new System.Uri(#"C:\windows\media\ringout.wav"));
p2.Play();
The sleep is there simply to add a bit of a delay to the playback, making it clear that the two sounds do actually play at the same time.
I've got a little side project going on using SDL2/SDL_mixer and a couple other sound libraries. I've been trying for a while now to synchronize my audio and video but haven't been able to get it anywhere near successfully. All new to this stuff so forgive the poorman's logic and coding. At first I thought to set the delay to SDL_Delay(30) after every frame, and then a few other numbers in that range. Not quite right. Then I tried doing it by getting Ticks. Where I would get the difference between current_ticks and last_ticks and set a delay if the delta between ticks was <=30 and set the delay to 30-delta. Still not quite right (by far). Hoping someone on here with more experience might guide me in the right direction. In regards to the video, it's a visualizer of course, seems like a popular beginners project.
The basic way you synchronize audio and video is that you choose one to use as a timer source and present the other according to that timer. The easiest is generally audio, but because it's generally buffered ahead, you need some method of measuring what time in the audio stream is actually coming out of the speakers. Once you get that, it's just a matter of waiting until the audio reaches the right time for the next video frame and displaying it.
I have an app which plays a few short sound clips. To play them I simply set the source to the new clip path, which is a WMA I encoded with Expression Encoder using WP7 settings. It's not even worth sharing the code -- there's an event handler. In it, I set the ME.Source property to a new Uri. It's set to AutoPlay, so that's it! Here:
private void PlaySound(ItemViewModel sound) {
Model.CurrentSound = sound;
CurrentSound.Source = new Uri(sound.Path, UriKind.Relative);
}
private void Sounds_SelectionChanged(object sender, SelectionChangedEventArgs e) {
var list = ((ListBox) sender);
var item = (ItemViewModel) list.SelectedItem;
SelectItem(item);
}
Also I should point out that the sounds are all resources (build type = Resource). I need them to be because the app needs to discover them dynamically. The paths are all like this, "sounds/foo/bar/sound.wma". Sometimes there is a space in the path, it is url encoded with %20 (this is how the resource manager returns the path, I didn't do that).
The problem is many people, but not all, are saying that the sound auto-repeats. The sounds are very short, only a few seconds, so it's very annoying. I don't understand how this is happening, the MediaElement doesn't even have an auto repeat feature.
Perhaps related, but some have also complained that every now and then the sound does not play. They have to click it again. All I can think of is that there is something wrong with how the sounds are encoded, but they are WMA, and as I said, I encoded them using the 'playback in WP7' settings in expression encoder. How could it be that it works usually but not other times if that were the case, anyway?
I'm at a loss and my app is getting some bad reviews because of this behavior. Help!
"there's and event handler" but you don't say of what? It could be that event firing over and over or not at all in some cases. Potentially your code has a logical errors where you have failed to detach an existing handler and then added another. As usage progresses you end up with a single event being handled by multiple handlers.
Edit
The Selection changed event is notorious for firing more frequently than we'd like. I suggest you add some debounce code that makes record of the last item selected and how long ago. If the next selected item is the same as the last one and it was say less than a second ago then swallow the event without doing anything else.
It sounds like you might be trying to play Sound Effects - in which case you might be better off using the XNA SoundEffect mechanism
e.g. http://www.japf.fr/2010/08/sound-effect-in-wp7-sl-application/
SoundEffect only works for WAV files (PCM) - but I've used it in several apps and scripts including embedded content files and downloaded files (e.g. translation and ironruby scripts).
The XNA class works well within SL and allows multiple sound effects to be played at the same time.
The problem with repeating turned out to be needing to do this:
MediaPlayer.IsRepeating = false;
I think what happened was the user would be in another app that sets this to true, and upon opening my app that value was still true! That has to be a bug, it's totally unexpected. If you look at other sound-playing apps like soundboard apps, there are users complaining in the reviews about the very same thing.. "I wish it wouldn't repeat the sounds..."
Im showing a video int my application, but its being chopped up, its locally on disc so I dont understand why this is so... any way i can start to preload it before playing it - so the content would be buffered?
EDIT: Im playing a wmv HD video from the samples provided by Microsoft. I play the video using a MediaElement:
MediaElement mediaElement = new MediaElement();
mediaElement.Source = new Uri(fileLocation, UriKind.Absolute);
mediaElement.LoadedBehavior = MediaState.Play;
The "chopped up behaviour refrs to that I see 2 secs, then it stops for a split second and plays again for a couple of seconds - almost like it cant read the movie fast enough to play it
EDIT 2 Seemed to be fixed when run it on another machine guess the bottle neck is on my machine. Closing question
Closing, see my last update
I'm attempting to use a large number of short sound samples in a game I'm creating in Silverlight 2. The samples are less than 2 seconds long.
I would prefer to load all the audio samples onto the canvas during the initualization. I have been adding the media element to the canvas and a generic list to manage it. So far, it appears to work.
When I play the sample the first time, it plays perfectly. If it has finished playing and I want to re-use the same element, it cuts off the first part of the sound. To play the sample again, I stop and play the media element.
Is there another method I should use the samples so that the audio is not clipped and good performance is obtained?
Also, it's probably a good idea to make sure that all of your audio samples are brought down to the client side initially. Depending on how you set it up, it's possible that the MediaElements are using their progressive download functionality to get the media files from the server. While there's nothing wrong with this per se (browser caching should be helping you out after the initial download), it does mean that you have to deal with the browser cache, and there are some potential issues there.
Possible steps to try:
Mark your audio files as "Content". This will get them balled up in the .xap.
Load your audio files into MemoryStreams (see Application.GetResourceStream method) and call MediaElement.SetSource().
HTH,
Erik
Some comments:
From MSDN:
Try to limit the number of MediaElement objects you have in your application at once. If you have over one hundred MediaElement objects in your application tree, regardless of whether they are playing concurrently or not, MediaFailed events may be raised. The way to work around this is to add MediaElement objects to the tree as they are needed and remove them when they are not.
You could try to seek to the start of the sample to reset the point currently being played before re-using it with:
mediaelement.Position = new TimeSpan();
See also MSDNs MediaElement.Position.
One techique you can use, although I'm not sure how well it will work in Silverlight, is create one large file with all of your samples joined together (probably with a half-second or so of silence between each). Figure out the timecode for each sample and seek the media element to that position and play. You'll only need as many media elements as simultaneous sounds you want to play.