Xamarin Forms Faster MonkeyTapWithSound

It's basically a modification of this program at https://github.com/xamarin/xamarin-forms-book-samples/tree/master/Chapter09/MonkeyTapWithSound

Modify the MonkeyTapWithSound program to initialize the sound buffers at launch. 1. Create a new project called MTWSFast. Copy the files IPlatformSoundPlayer. and MonkeyTapWithSounPage.cs to the MTWSFast folder. Change the namespace to MTWSFast . Copy the 3 instances of PlatformSoundPlayer.cs to their respective Android, iOS and UWP folders. Change the namespace to MTWSFast. . Set App.xaml.cs MainPage to MonkeyTapWithSoundPage. At this point the game should run the same as the original MTWSound. Verify this on Android and UWP. 2. The following are suggestions. If you want to do this in another fashion, feel free. The goal is to NOT modify the original MonkeyTap.cs file, but to do the modifications by overriding its methods. 3. Add a list of byte buffers to the MonkeyTapWithSoundPage class: 4. 5. Split PlaySound into a MakeBuffer method with parameters (frequency) that returns a sound buffer, and another method PlayBufferedSound with the parameter (). 6. Add a method to MonkeyTapWithSoundPage to initialize the buffers in SoundPlayer. A good choice is to override InitializeBoxView. This method should step through the 4 existing frequencies and add a 5th buffer for the error sound. Make a for loop to set up buffers 0, 1, 2 and 3 with the frequency and flashDuration, and one more call outside the loop with endFrequency and errorDuration Modify FlashBoxView to call PlayBufferedSound with buffers[index] and flashDuration, and EndGame to use PlayBufferedSound with endBuffer and endDuration.

I've modified the soundplayer.cs to look like this:

using System; using System.Collections.Generic; using System.Linq; using System.Text;

using Xamarin.Forms;

namespace MTWSFast { class SoundPlayer { const int samplingRate = 22050;

// Hard-coded for monaural, 16-bit-per-sample PCM public static byte[] MakeBuffer(double frequency = 400, int duration = 250) { short[] shortBuffer = new short[samplingRate * duration / 1000]; double angleIncrement = frequency / samplingRate; double angle = 0.0;

for (int i = 0; i

// 0 to 1 if (angle

// 1 to -1 else if (angle

// -1 to 0 else sample = 4 * (angle - 1);

shortBuffer[i] = (short)(32767 * sample); angle += angleIncrement;

while (angle > 1) angle -= 1; }

byte[] byteBuffer = new byte[2 * shortBuffer.Length]; Buffer.BlockCopy(shortBuffer, 0, byteBuffer, 0, byteBuffer.Length); return byteBuffer; } public static void PlayBufferSound(byte[] byteBuffer) { DependencyService.Get().PlaySound(samplingRate, byteBuffer); } } }

But I've hit a wall on how I should finish the MonkeyTapPlayerWithSoundPage:

namespace MTWSFast { class MonkeyTapWithSoundPage : MonkeyTap.MonkeyTapPage { const int errorDuration = 500;

// Diminished 7th in 1st inversion: C, Eb, F#, A double[] frequencies = { 523.25, 622.25, 739.99, 880 }; double endFrequency = 65.4;

List buffers; byte[] endBuffer;

protected override void FlashBoxView(int index) { SoundPlayer.PlaySound(frequencies[index]); base.FlashBoxView(index); }

protected override void InitializeBoxView() { buffers = new List(); for(int i = 0; i

base.InitializeBoxView(); }

protected override void EndGame() { SoundPlayer.PlaySound(65.4); base.EndGame(); } } }

Any help would be appreciated.

class MonkeyTapwithSoundPage MonkeyTap .MonkeyTapPage const int errorDuration500; // Diminished 7th in 1st inversion: C, Eb, F#, A double[] frequencies- 523.25, 622.25, 739.99, 880 J; double endFrequency65.4; List buffers; byte[] endBuffer; class MonkeyTapwithSoundPage MonkeyTap .MonkeyTapPage const int errorDuration500; // Diminished 7th in 1st inversion: C, Eb, F#, A double[] frequencies- 523.25, 622.25, 739.99, 880 J; double endFrequency65.4; List buffers; byte[] endBuffer