public VideoHelper(string saveToPath)
{
if (string.IsNullOrEmpty(saveToPath))
{
_savetoPath = string.Format(@"{0}\{1}.wmv", Environment.CurrentDirectory, TextHelper.RandomString(10));
}
else
{
_savetoPath = saveToPath;
}
try
{
encoder = new WMEncoder();
IWMEncSourceGroup2 SrcGrp;
IWMEncSourceGroupCollection SrcGrpColl;
SrcGrpColl = encoder.SourceGroupCollection;
SrcGrp = (IWMEncSourceGroup2)SrcGrpColl.Add("SG_1");
IWMEncVideoSource2 SrcVid;
SrcVid = (IWMEncVideoSource2)SrcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_VIDEO);
SrcVid.SetInput("ScreenCapture1", "ScreenCap", "");
IWMEncProfileCollection ProColl;
IWMEncProfile Pro;
int i;
long lLength;
ProColl = encoder.ProfileCollection;
lLength = ProColl.Count;
for (i = 0; i < lLength; i++)
{
Pro = ProColl.Item(i);
if (Pro.Name == "Screen Video High (CBR)")
{
SrcGrp.set_Profile((IWMEncProfile)Pro);
break;
}
}
}
catch (Exception ex)
{
throw new Exception(string.Format("{0}\r\nPlease install WMEncoder.exe http://www.microsoft.com/en-us/download/details.aspx?id=17792. \r\n And install WMEncoder Patch http://download.microsoft.com/download/0/3/D/03D35C05-67DA-40E0-9E45-3EA0CA6329A4/WindowsMedia9-KB929182-INTL.exe.", ex.Message));
}
}
private void btnStart_Click(object sender, EventArgs e)
{
// 实例化Windows Media Encoder编码器
enc = new WMEncoderClass();
IWMEncSourceGroupCollection SrcGrpColl;
IWMEncSourceGroup2 SrcGrp;
// 音频源
//IWMEncAudioSource SrcAud;
// 视频源
IWMEncVideoSource2 SrcVid;
//IWMEncProfile2 Pro = new WMEncProfile2Class();
try
{
SrcGrpColl = enc.SourceGroupCollection;
SrcGrp = (IWMEncSourceGroup2)SrcGrpColl.Add("SG_1");
SrcVid = (IWMEncVideoSource2)SrcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_VIDEO);
Screen currentScreen;
if (hWndURWPGSim2D == 0)
{// 获取当前窗口所在屏幕作为当前屏幕
currentScreen = Screen.FromHandle(this.Handle);
}
else
{// 获取待屏幕录像的URWPGSim2D程序主窗口所在屏幕作为当前屏幕
currentScreen = Screen.FromHandle((IntPtr)hWndURWPGSim2D);
hWndURWPGSim2D = 0;
}
// 以当前屏幕设备作为视频来源设备
SrcVid.SetInput(currentScreen.DeviceName, "ScreenCap", "");
//SrcVid.SetInput("ScreenCapture1", "ScreenCap", "");
// 设置音频来源
//if (ckbSound.Checked)
//{
// SrcAud = (IWMEncAudioSource)SrcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_AUDIO);
// SrcAud.SetInput("Default_Audio_Device", "DEVICE", "");
//}
foreach (IWMEncProfile wp in enc.ProfileCollection)
{ // 循环检查当前编码器实例中包含的全部配置文件
if (wp.Name.Equals(cmbEncoder.SelectedItem.ToString()))
{ // 如果当前配置文件（Profile）名称与选中的移植
// 将当前Profile设为当前视频源的配置文件
SrcGrp.set_Profile(wp);
break;
}
}
// 为当前编码器实例设定输出文件名称
enc.File.LocalFileName = txtFileName.Text;
// 从界面输入取得待录屏区域左上角坐标/宽度/高度（单位为像素）
int x = Convert.ToInt32(txtX.Text);
int y = Convert.ToInt32(txtY.Text);
int w = Convert.ToInt32(txtWidth.Text);
int h = Convert.ToInt32(txtHeight.Text);
// 适应多显示器环境 取得当前系统所有显示器构成的虚拟屏幕区域
Rectangle screenRect = SystemInformation.VirtualScreen;
#region
//// 为当前视频源设定宽度为当前屏幕宽度
//SrcVid.Width = currentScreen.Bounds.Width;
//// 为当前视频源设定高度为当前屏幕高度
//SrcVid.Height = currentScreen.Bounds.Height;
//// 对当前视频源进行裁剪 裁剪后的视频宽度高度即为待录像区域宽度高度
//// 左边裁掉待录像区域左上角坐标X值的大小
//SrcVid.CroppingLeftMargin = x;
//// 上边裁掉待录像区域左上角坐标Y值的大小
//SrcVid.CroppingTopMargin = y;
//// 右边裁掉总宽度和左边裁剪尺寸、待录像区域宽度之差
//SrcVid.CroppingRightMargin = SrcVid.Width - SrcVid.CroppingLeftMargin - w;
//// 下边裁掉总高度和上边裁剪尺寸、待录像区域高度之差
//SrcVid.CroppingBottomMargin = SrcVid.Height - SrcVid.CroppingTopMargin - h;
#endregion
#region
//int wm = SystemInformation.VirtualScreen.Width;
//int hm = SystemInformation.VirtualScreen.Height;
//SrcVid.Width = w;
//SrcVid.Height = h;
//float rx = (float)wm / (float)SrcVid.Width;
//float ry = (float)hm / (float)SrcVid.Height;
//SrcVid.CroppingLeftMargin = (int)(x / rx);
//SrcVid.CroppingTopMargin = (int)(y / ry);
//SrcVid.CroppingRightMargin = (int)((wm - x - w) / rx);
//SrcVid.CroppingBottomMargin = (int)((hm - y - h) / ry);
#endregion
#region
// 为当前视频源设定宽度为整个虚拟屏幕宽度
SrcVid.Width = screenRect.Width;
// 为当前视频源设定高度为整个虚拟屏幕高度
SrcVid.Height = screenRect.Height;
// 对当前视频源进行裁剪 裁剪后的视频宽度高度即为待录像区域宽度高度
// 左边裁掉待录像区域左上角坐标X值与虚拟屏幕左上角坐标X值之差
SrcVid.CroppingLeftMargin = x - screenRect.Left;
// 上边裁掉待录像区域左上角坐标Y值与虚拟屏幕左上角坐标Y值之差
SrcVid.CroppingTopMargin = y - screenRect.Top;
// 右边裁掉总宽度和左边裁剪尺寸、待录像区域宽度之差
SrcVid.CroppingRightMargin = SrcVid.Width - SrcVid.CroppingLeftMargin - w;
// 下边裁掉总高度和上边裁剪尺寸、待录像区域高度之差
SrcVid.CroppingBottomMargin = SrcVid.Height - SrcVid.CroppingTopMargin - h;
#endregion
#region
//SrcVid.Width = w;
//SrcVid.Height = h;
//float rx = (float)screenRect.Width / (float)SrcVid.Width;
//float ry = (float)screenRect.Height / (float)SrcVid.Height;
//SrcVid.CroppingLeftMargin = (int)((x - screenRect.Left) / rx);
//SrcVid.CroppingTopMargin = (int)((y - screenRect.Top) / ry);
//SrcVid.CroppingRightMargin = (int)((screenRect.Width - (x - screenRect.Left) - w) / rx);
//SrcVid.CroppingBottomMargin = (int)((screenRect.Height - (y - screenRect.Top) - h) / ry);
#endregion
// 最小化Screencast程序主窗口
this.WindowState = FormWindowState.Minimized;
// 开始编码
enc.Start();
btnStop.Enabled = true;
btnStart.Enabled = false;
this.TopMost = false;
}
catch (Exception e1)
{
MessageBox.Show(e1.Message);
}
}