声卡播放内存波形

如何把内存波形从声卡播放

看了几个stackoverflow 的帖子,试验成功如下:

引用 NAudio

//引用
using NAudio.Wave;

//全局申请波形播放变量
        WaveOut _waveOut = new WaveOut(); //播放器对象
        IWaveProvider provider; //播放流提供者
        byte[] dataByte; //播放波形 Int16平铺成Byte

//取得波形
//假设波形长度 sizeByte/2, 你已经读取到dataInt16
            short[] dataInt16 = new short[sizeByte / 2];
            dataByte = new byte[sizeByte];   
            Buffer.BlockCopy(dataInt16, 0, dataByte, 0, (int) sizeByte);
            
//初始化播放器
            //初始化流提供者
            provider = new RawSourceWaveStream(new MemoryStream(dataByte), new WaveFormat(11025, 1));
            _waveOut.Init(provider); //初始化媒体播放

//播放
            _waveOut.Play();
            
//停止
            _waveOut.Stop();
            //停止后初始化流, 不然等同于Pause
            provider = new RawSourceWaveStream(new MemoryStream(dataByte), new WaveFormat(11025, 1));
            _waveOut.Init(provider);
            
//暂停
            _waveOut.Pause();

当然, 上面的播放、停止、暂停都是事件响应哦,不要真的拷贝在一起运行啊。

感谢

  • 主体播放方法:
    https://stackoverflow.com/questions/28792548/how-can-i-play-byte-array-of-audio-raw-data-using-naudio
  • Int16 - Byte拷贝:
    https://stackoverflow.com/questions/7152034/convert-short-to-stream-which-can-be-played-as-audio

另一个方法是用MS自己的MediaPlayer

https://docs.microsoft.com/en-us/dotnet/api/system.windows.media.mediaplayer?view=netframework-4.8
一时半会儿搞不定,不讲了。
有个链接,但是看上去就不完整:
https://stackoverflow.com/questions/6340967/play-wav-mp3-from-memory

完整可工作代码

C# 代码, Form控件请脑补, 需要用JYTek SeeSharp Tools的EasyChartX

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using NAudio.Wave;
using System.IO;

namespace StudyNAudio
{
    public partial class Form1 : Form
    {
        //波形播放变量
        WaveOut _waveOut = new WaveOut(); //播放器对象
        IWaveProvider provider; //播放流提供者
        byte[] dataByte; //播放波形 Int16平铺成Byte

        public Form1()
        {
            InitializeComponent();
        }

        private void buttonLoad_Click(object sender, EventArgs e)
        {
            var reader = new Mp3FileReader(textBoxFileName.Text);
            MemoryStream memStream = new MemoryStream();
            WaveFileWriter.WriteWavFileToStream(memStream, reader);

            BinaryReader br = new BinaryReader(memStream, Encoding.UTF8);
            long sizeByte = memStream.Length-memStream.Position;
            short[] dataInt16 = new short[sizeByte / 2];
            dataByte = new byte[sizeByte];          
            for (int i = 0; i < dataInt16.Length; i++)
            {
                dataInt16[i] = br.ReadInt16();
            }
            Buffer.BlockCopy(dataInt16, 0, dataByte, 0, (int) sizeByte);
            easyChartX1.Plot(dataInt16);

            //初始化流提供者
            provider = new RawSourceWaveStream(new MemoryStream(dataByte), new WaveFormat(11025, 1));
            _waveOut.Init(provider); //初始化媒体播放
        }

        private void buttonPlay_Click(object sender, EventArgs e)
        {
            _waveOut.Play();
        }

        private void buttonStop_Click(object sender, EventArgs e)
        {
            _waveOut.Stop();
            //停止后初始化流, 不然等同于Pause
            provider = new RawSourceWaveStream(new MemoryStream(dataByte), new WaveFormat(11025, 1));
            _waveOut.Init(provider);
        }

        private void buttonPause_Click(object sender, EventArgs e)
        {
            _waveOut.Pause();
        }
    }
}

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