windows phone 7 通过麦克风录音,并且播放

原文:windows phone 7 通过麦克风录音,并且播放

//模拟XNA的框架（凡是在wp7中应用xna的都必须先模拟此类）

public class XNAAsyncDispatcher : IApplicationService
        {
            private DispatcherTimer frameworkDispatcherTimer;
            public XNAAsyncDispatcher(TimeSpan dispatchInterval)
            {
                this.frameworkDispatcherTimer = new DispatcherTimer();
                this.frameworkDispatcherTimer.Tick += new EventHandler(frameworkDispatcherTimer_Tick);
                this.frameworkDispatcherTimer.Interval = dispatchInterval;
            }
            void IApplicationService.StartService(ApplicationServiceContext context)
            {
                this.frameworkDispatcherTimer.Start();
            }
            void IApplicationService.StopService()
            {
                this.frameworkDispatcherTimer.Stop();
            }
            void frameworkDispatcherTimer_Tick(object sender, EventArgs e)
            {
                FrameworkDispatcher.Update();
            }
     }

在App 构造函数里写
this.ApplicationLifetimeObjects.Add(new XNAAsyncDispatcher(TimeSpan.FromMilliseconds(50)));

当程序激动时就开始模拟XNA GameTimer

//后代代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using System.IO;
using Microsoft.Xna.Framework.Audio;

namespace Wp7_录音
{
    public partial class MainPage : PhoneApplicationPage
    {
        // Constructor
        public MainPage()
        {
            InitializeComponent();
            mic.BufferReady += Default_BufferReady;
            SoundEffect.MasterVolume = 1.0f;
        }

        MemoryStream ms;
        Microphone mic = Microphone.Default;  

        // Wire up an event handler so we can empty the buffer when full
        // Crank up the volume to max      

        // When the buffer's ready we need to empty it
        // We'll copy to a MemoryStream
        // We could push into IsolatedStorage etc
        void Default_BufferReady(object sender, EventArgs e)
        {
            byte[] buffer = new byte[1024];
            int bytesRead = 0;
            while ((bytesRead = mic.GetData(buffer, 0, buffer.Length)) > 0)
            ms.Write(buffer, 0, bytesRead);
        }
        // The user wants to start recording. If we've already made
        // a recording, close that MemoryStream and create a new one.
        // Start recording on the default device.
        private void start_Click(object sender, RoutedEventArgs e)
        {
            if (ms != null)
                ms.Close();
            ms = new MemoryStream();
            mic.Start();
        }
        // The user wants to stop recording. Checks the microphone
        // is stopped. Reset the MemoryStream position.
        // Play back the recording. Pitch is based on slider value
        private void stop_Click(object sender, RoutedEventArgs e)
        {
            if (mic.State != MicrophoneState.Stopped)
                mic.Stop();
            ms.Position = 0;
            SoundEffect se =  new SoundEffect(ms.ToArray(), mic.SampleRate, AudioChannels.Mono);
            //se.Play(1.0f, (float)slider1.Value, 0.0f);
            se.Play();
        }
    }
}

本实例UI就两个Button  一个start 一个stop, 还有一个滑动条  Silder.