在Windows Phone上同时播放声音

Question

At first, I want to say that I had read all topics related to my problem here, on stackoverflow (and of course googled), but those research provided no solution to my problem. I'm writing app for Windows Phone and I need to play two sounds simultaneously, but this code doesn't work, because there is slight, but noticeable dealy between two sounds, and there must be NO perceptible delay in my project.

Stream s1 = TitleContainer.OpenStream("C.wav");
Stream s2 = TitleContainer.OpenStream("C1.wav");
SoundEffectInstance sci = sc.CreateInstance();
SoundEffectInstance sci1 = sc1.CreateInstance();
sci.Play();
sci1.Play();

I also tried to perform a simple mix of two wav files, but it doesn't work for a reason that I don't know. (ArgumentException - Ensure that the specified stream contains valid PCM mono or stereo wave data. - is thrown, when calling SoundEffect.FromStream(WAVEFile.Mix(s1, s2));

    public static Stream Mix(Stream in1,Stream in2)
    {
        BinaryWriter bw;
        bw = new BinaryWriter(new MemoryStream());
        byte[] header = new byte[44];
        in1.Read(header, 0, 44);
        bw.Write(header);
        in2.Seek(44, SeekOrigin.Begin);
        BinaryReader r1 = new BinaryReader(in1);
        BinaryReader r2 = new BinaryReader(in2);
        while (in1.Position != in1.Length)
        {
            bw.Write((short)(r1.ReadInt16() + r2.ReadInt16()));
        }
        r1.Dispose();
        r2.Dispose();
        bw.BaseStream.Seek(0, SeekOrigin.Begin);
        return bw.BaseStream;
    }

Stream s1 = TitleContainer.OpenStream("C.wav");
Stream s2 = TitleContainer.OpenStream("C1.wav");
s3 = SoundEffect.FromStream(WAVEFile.Mix(s1, s2));

So, does anyone know how to play two sounds at the time?

Answer 1

So your first solution SHOULD work. I have another solution that is very similar with a twist that I KNOW works.

static Stream stream1 = TitleContainer.OpenStream("soundeffect.wav");
static SoundEffect sfx = SoundEffect.FromStream(stream1);
static SoundEffectInstance soundEffect = sfx.CreateInstance();

public void playSound(){
    FrameworkDispatcher.Update();
    soundEffect.Play();
}

The reason your second solution didnt work is because there are very specific file formats that the windows phone can play.

List of supported formats

http://msdn.microsoft.com/en-us/library/windowsphone/develop/ff462087(v=vs.105).aspx

Reference for this code is my blog

http://www.anthonyrussell.info/postpage.php?name=60

Edit

You can see the above solution working here

http://www.windowsphone.com/en-us/store/app/xylophone/fe4e0fed-1130-e011-854c-00237de2db9e

Edit#2

In response to the comment below that this code doesn't work I have also posted a working, published app on my blog that implements this very code. It's called Xylophone, it's free and you can download the code here at the bottom of the page.

http://anthonyrussell.info/postpage.php?name=60