实例介绍
【实例简介】使用wpf开发的的获取电脑音频，生成wav文件，并实时显示音频的波形图，参考Sound_Viewer编写
【实例截图】
【核心代码】
/* Copyright (C) 2007 Jeff Morton (jeffrey.raymond.morton@gmail.com)
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
using System;
using System.Drawing;
using System.Windows.Controls;
//using System.Windows.Forms;
using System.Windows.Media;
using System.Windows.Shapes;
using System.Threading;
namespace AudioDemo
{
class AudioFrame
{
private double[] _waveLeft;
private double[] _waveRight;
private double[] _fftLeft;
private double[] _fftRight;
private SignalGenerator _signalGenerator;
private bool _isTest = false;
public AudioFrame(bool isTest)
{
_isTest = isTest;
}
/// <summary>
/// Process 16 bit sample
/// </summary>
/// <param name="wave"></param>
public void Process(ref byte[] wave)
{
_waveLeft = new double[wave.Length / 4];
//双声道时需要释放注释
//_waveRight = new double[wave.Length / 4];
if (_isTest == false)
{
// Split out channels from sample
int h = 0;
for (int i = 0; i < wave.Length; i = 4)
{
_waveLeft[h] = (double)BitConverter.ToInt16(wave, i);
//双声道时需要释放注释
//_waveRight[h] = (double)BitConverter.ToInt16(wave, i 2);
h ;
}
}
else
{
// Generate artificial sample for testing
_signalGenerator = new SignalGenerator();
_signalGenerator.SetWaveform("Sine");
_signalGenerator.SetSamplingRate(44100);
_signalGenerator.SetSamples(16384);
_signalGenerator.SetFrequency(2000);
_signalGenerator.SetAmplitude(32768);
_waveLeft = _signalGenerator.GenerateSignal();
_waveRight = _signalGenerator.GenerateSignal();
}
// Generate frequency domain data in decibels
_fftLeft = FourierTransform.FFTDb(ref _waveLeft);
//双声道时需要释放注释
//_fftRight = FourierTransform.FFTDb(ref _waveRight);
}
/// <summary>
/// Render time domain to PictureBox
/// 时域
/// </summary>
/// <param name="pictureBox"></param>
public void RenderTimeDomain(ref Canvas canvas)
{
canvas.Children.Clear();
// Determine channnel boundries
int width = (int)canvas.Width;
//单声道的时候center = (int)canvas.Height，双声道的时候center = (int)canvas.Height/2
int center = (int)canvas.Height;
int height = (int)canvas.Height;
int leftLeft = 0;
int leftTop = 0;
int leftRight = width;
int leftBottom = center - 1;
// Draw left channel
double yCenterLeft = (leftBottom - leftTop) / 2;
double yScaleLeft = 0.5 * (leftBottom - leftTop) / 32768; // a 16 bit sample has values from -32768 to 32767
int xPrevLeft = 0, yPrevLeft = 0;
for (int xAxis = leftLeft; xAxis < leftRight; xAxis )
{
int yAxis = (int)(yCenterLeft (_waveLeft[_waveLeft.Length / (leftRight - leftLeft) * xAxis] * yScaleLeft));
if (xAxis == 0)
{
xPrevLeft = 0;
yPrevLeft = yAxis;
}
else
{
Line draw1 = new Line();
draw1.Stroke = Brushes.Red;//外宽颜色，在直线里为线颜色
draw1.StrokeThickness = 1;//线宽度
draw1.X1 = xPrevLeft;
draw1.Y1 = yPrevLeft;
draw1.X2 = xAxis;
draw1.Y2 = yAxis;
canvas.Children.Add(draw1);
xPrevLeft = xAxis;
yPrevLeft = yAxis;
}
}
// Draw right channel
//int rightLeft = 0;
//int rightTop = center 1;
//int rightRight = width;
//int rightBottom = height;
//int xCenterRight = rightTop ((rightBottom - rightTop) / 2);
//double yScaleRight = 0.5 * (rightBottom - rightTop) / 32768; // a 16 bit sample has values from -32768 to 32767
//int xPrevRight = 0, yPrevRight = 0;
//for (int xAxis = rightLeft; xAxis < rightRight; xAxis )
//{
// int yAxis = (int)(xCenterRight (_waveRight[_waveRight.Length / (rightRight - rightLeft) * xAxis] * yScaleRight));
// if (xAxis == 0)
// {
// xPrevRight = 0;
// yPrevRight = yAxis;
// }
// else
// {
// //pen.Color = Color.LimeGreen;
// Line draw2 = new Line();
// draw2.Stroke = Brushes.Red;//外宽颜色，在直线里为线颜色
// //mydrawline.Stroke = new SolidColorBrush(Color.FromArgb(0xFF, 0x5B, 0x9B, 0xD5));//自定义颜色则用这句
// draw2.StrokeThickness = 2;//线宽度
// draw2.X1 = xPrevLeft;
// draw2.Y1 = yPrevLeft;
// draw2.X2 = xAxis;
// draw2.Y2 = yAxis;
// //canvas.Children.Clear();
// canvas.Children.Add(draw2);
// //offScreenDC.DrawLine(pen, xPrevRight, yPrevRight, xAxis, yAxis);
// xPrevRight = xAxis;
// yPrevRight = yAxis;
// }
//}
}
/// <summary>
/// Render frequency domain to PictureBox
/// 频域
/// </summary>
/// <param name="pictureBox"></param>
public void RenderFrequencyDomain(ref Canvas canvas)
{
// Set up for drawing
canvas.Children.Clear();
// Determine channnel boundries
int width = (int)canvas.Width;
//单声道的时候center = (int)canvas.Height，双声道的时候center = (int)canvas.Height/2
int center = (int)canvas.Height;
int height = (int)canvas.Height;
int leftLeft = 0;
int leftTop = 0;
int leftRight = width;
int leftBottom = center - 1;
// Draw left channel
for (int xAxis = leftLeft; xAxis < leftRight; xAxis )
{
double amplitude = (int)_fftLeft[(int)(((double)(_fftLeft.Length) / (double)(width)) * xAxis)];
if (amplitude < 0) // Drop negative values
amplitude = 0;
int yAxis = (int)(leftTop ((leftBottom - leftTop) * amplitude) / 100); // Arbitrary factor
Line draw1 = new Line();
draw1.Stroke = Brushes.Red;//外宽颜色，在直线里为线颜色
draw1.StrokeThickness = 1;//线宽度
//顶部显示
//draw1.X1 = xAxis;
//draw1.Y1 = leftTop;
//draw1.X2 = xAxis;
//draw1.Y2 = yAxis;
//底部显示
draw1.X1 = xAxis;
draw1.Y1 = leftBottom;
draw1.X2 = xAxis;
draw1.Y2 = leftBottom - yAxis;
canvas.Children.Add(draw1);
}
// Draw right channel
//int rightLeft = 0;
//int rightTop = center 1;
//int rightRight = width;
//int rightBottom = height;
//for (int xAxis = rightLeft; xAxis < rightRight; xAxis )
//{
// double amplitude = (int)_fftRight[(int)(((double)(_fftRight.Length) / (double)(width)) * xAxis)];
// if (amplitude < 0)
// amplitude = 0;
// int yAxis = (int)(rightBottom - ((rightBottom - rightTop) * amplitude) / 100);
// Line draw2 = new Line();
// draw2.Stroke = Brushes.Red;//外宽颜色，在直线里为线颜色
// draw2.StrokeThickness = 1;//线宽度
// //底部显示
// draw2.X1 = xAxis;
// draw2.Y1 = rightBottom;
// draw2.X2 = xAxis;
// draw2.Y2 = yAxis;
// canvas.Children.Add(draw2);
}
}
}
}
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