How can I play a sound based on waveform data that my .NET program is generating from user input and mathematical functions?
By \"waveform data\" I mean SPL (sound press
You can do this using NAudio. You create a stream that derives from WaveStream and in its overriden Read method, you return your samples which you can generate on the fly. You have control over the size of the buffers used by the soundcard which gives you control over the latency.
I have this code but you will have to have code to generate your wav file in memory.
Option Strict Off
Option Explicit On
Imports Microsoft.DirectX.DirectSound
Imports Microsoft.DirectX
Imports System.Threading
Public Class Form1
Const SRATE As Integer = 44100
Const FREQ As Integer = 440
Const DUR As Integer = 1
Private dsDesc As BufferDescription
Private wvFormat As WaveFormat
Private DS As Device
Dim SecondaryBuffer As Microsoft.DirectX.DirectSound.SecondaryBuffer
Dim BufferDescription As Microsoft.DirectX.DirectSound.BufferDescription
Dim DXFormat As Microsoft.DirectX.DirectSound.WaveFormat
Dim sbuf(DUR * SRATE) As Short
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Show()
DS = New Microsoft.DirectX.DirectSound.Device
DS.SetCooperativeLevel(Me, CooperativeLevel.Normal)
wvFormat.FormatTag = WaveFormatTag.Pcm
wvFormat.Channels = 1
wvFormat.SamplesPerSecond = SRATE
wvFormat.BitsPerSample = 16
wvFormat.AverageBytesPerSecond = 2 * SRATE
wvFormat.BlockAlign = 2
dsDesc = New BufferDescription(wvFormat)
dsDesc.BufferBytes = 2 * DUR * SRATE
dsDesc.Flags = 0
Dim buff1 = PlayWave(400)
Dim buff2 = PlayWave(600)
buff1 = PlayWave(400)
buff1.Play(0, Microsoft.DirectX.DirectSound.BufferPlayFlags.Default)
Thread.Sleep(1000)
buff1 = PlayWave(600)
buff1.Play(0, Microsoft.DirectX.DirectSound.BufferPlayFlags.Default)
' End
End Sub
Function PlayWave(FREQ As Integer) As SecondaryBuffer
' create a buffer
Dim dsBuffer As SecondaryBuffer
dsBuffer = New SecondaryBuffer(dsDesc, DS)
Dim sbuf(DUR * SRATE) As Short
' create tone
For i As Integer = 0 To DUR * SRATE
sbuf(i) = CShort(10000 * Math.Sin(2 * Math.PI * FREQ * i / SRATE))
Next
' copy to buffer
dsBuffer.Write(0, sbuf, LockFlag.EntireBuffer)
Return dsBuffer
End Function
I think you'll need to use DirectSound (DirectX API) for that. It works off buffers which you could fill with your generated data.
Maybe something like this (here in way back machine) will help
Check out this thread on loading up a DirectSound buffer with arbitrary data and playing it.
Per comment: Yes, I know. You will need to translate the C++ into C# or VB.NET. But, the concept is what's important. You create a secondary DirectSound buffer and then use it to stream over to your primary buffer and play.
How to play from an array of doubles
PlayerEx pl = new PlayerEx();
private static void PlayArray(PlayerEx pl)
{
double fs = 8000; // sample freq
double freq = 1000; // desired tone
short[] mySound = new short[4000];
for (int i = 0; i < 4000; i++)
{
double t = (double)i / fs; // current time
mySound[i] = (short)(Math.Cos(t * freq) * (short.MaxValue));
}
IntPtr format = AudioCompressionManager.GetPcmFormat(1, 16, (int)fs);
pl.OpenPlayer(format);
byte[] mySoundByte = new byte[mySound.Length * 2];
Buffer.BlockCopy(mySound, 0, mySoundByte, 0, mySoundByte.Length);
pl.AddData(mySoundByte);
pl.StartPlay();
}
IrrKlang, BASS.net (under "Other APIs"), NAudio, CLAM, G3D, and others that can do this.