C# Aforge设置摄像头视频属性和控制属性
2024-08-26 16:29:34
修改后的代码：github
一、调用windows自身摄像头属性设置窗口
使用VideoCaptureDevice对象的DisplayPropertyPage(IntPtr parentWindow)方法即可，以下是从Aforge源码里找到的调用api方式：
/// <summary>
/// Invokes a new property frame, that is, a property sheet dialog box.
/// </summary>
///
/// <param name="hwndOwner">Parent window of property sheet dialog box.</param>
/// <param name="x">Horizontal position for dialog box.</param>
/// <param name="y">Vertical position for dialog box.</param>
/// <param name="caption">Dialog box caption.</param>
/// <param name="cObjects">Number of object pointers in <b>ppUnk</b>.</param>
/// <param name="ppUnk">Pointer to the objects for property sheet.</param>
/// <param name="cPages">Number of property pages in <b>lpPageClsID</b>.</param>
/// <param name="lpPageClsID">Array of CLSIDs for each property page.</param>
/// <param name="lcid">Locale identifier for property sheet locale.</param>
/// <param name="dwReserved">Reserved.</param>
/// <param name="lpvReserved">Reserved.</param>
///
/// <returns>Returns <b>S_OK</b> on success.</returns>
///
[DllImport( "oleaut32.dll" )]
public static extern int OleCreatePropertyFrame(
IntPtr hwndOwner,
int x,
int y,
[MarshalAs( UnmanagedType.LPWStr )] string caption,
int cObjects,
[MarshalAs( UnmanagedType.Interface, ArraySubType = UnmanagedType.IUnknown )]
ref object ppUnk,
int cPages,
IntPtr lpPageClsID,
int lcid,
int dwReserved,
IntPtr lpvReserved );
二、通过代码自定义设置摄像头属性
aforge发布版只封装了对摄像头控制属性（缩放、焦点、曝光等）的设置方法，要想设置亮度、对比度这些属性，需要在源码上添加功能。
扩展代码原地址：https://code.google.com/archive/p/aforge/issues/357
有三个文件，都是Video.DirectShow项目下的：IAMVideoProcAmp.cs，VideoCaptureDevice.cs，VideoProcAmpProperty.cs
IAMVideoProcAmp.cs声明了几个调用com对象的方法，放在Internals文件夹下
// AForge Direct Show Library
// AForge.NET framework
// http://www.aforgenet.com/framework/
//
// Copyright © AForge.NET, 2009-2013
// contacts@aforgenet.com
// namespace AForge.Video.DirectShow.Internals
{
using System;
using System.Runtime.InteropServices; /// <summary>
/// The IAMVideoProcAmp interface controls camera settings such as brightness, contrast, hue,
/// or saturation. To obtain this interface, query the filter that controls the camera.
/// </summary>
[ComImport,
Guid("C6E13360-30AC-11D0-A18C-00A0C9118956"),
InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
internal interface IAMVideoProcAmp
{
/// <summary>
/// Gets the range and default value of a specified camera property.
/// </summary>
///
/// <param name="Property">Specifies the property to query.</param>
/// <param name="pMin">Receives the minimum value of the property.</param>
/// <param name="pMax">Receives the maximum value of the property.</param>
/// <param name="pSteppingDelta">Receives the step size for the property.</param>
/// <param name="pDefault">Receives the default value of the property. </param>
/// <param name="pCapsFlags">Receives a member of the VideoProcAmpFlags enumeration, indicating whether the property is controlled automatically or manually.</param>
///
/// <returns>Return's <b>HRESULT</b> error code.</returns>
///
[PreserveSig]
int GetRange(
[In] VideoProcAmpProperty Property,
[Out] out int pMin,
[Out] out int pMax,
[Out] out int pSteppingDelta,
[Out] out int pDefault,
[Out] out VideoProcAmpFlags pCapsFlags
); /// <summary>
/// Sets a specified property on the camera.
/// </summary>
///
/// <param name="Property">Specifies the property to set.</param>
/// <param name="lValue">Specifies the new value of the property.</param>
/// <param name="Flags">Specifies the desired control setting, as a member of the VideoProcAmpFlags enumeration.</param>
///
/// <returns>Return's <b>HRESULT</b> error code.</returns>
///
[PreserveSig]
int Set(
[In] VideoProcAmpProperty Property,
[In] int lValue,
[In] VideoProcAmpFlags Flags
); /// <summary>
/// Gets the current setting of a camera property.
/// </summary>
///
/// <param name="Property">Specifies the property to retrieve.</param>
/// <param name="lValue">Receives the value of the property.</param>
/// <param name="Flags">Receives a member of the VideoProcAmpFlags enumeration.
/// The returned value indicates whether the setting is controlled manually or automatically.</param>
///
/// <returns>Return's <b>HRESULT</b> error code.</returns>
///
[PreserveSig]
int Get(
[In] VideoProcAmpProperty Property,
[Out] out int lValue,
[Out] out VideoProcAmpFlags Flags
);
}
}
VideoCaptureDevice.cs添加了几个方法用来获取和设置参数，替换掉源文件即可，也可以在原文件加上这几个方法的代码
/// <summary>
/// Sets a specified property on the camera.
/// </summary>
///
/// <param name="property">Specifies the property to set.</param>
/// <param name="value">Specifies the new value of the property.</param>
/// <param name="controlFlags">Specifies the desired control setting.</param>
///
/// <returns>Returns true on success or false otherwise.</returns>
///
/// <exception cref="ArgumentException">Video source is not specified - device moniker is not set.</exception>
/// <exception cref="ApplicationException">Failed creating device object for moniker.</exception>
/// <exception cref="NotSupportedException">The video source does not support camera control.</exception>
///
public bool SetVideoProperty(VideoProcAmpProperty property, int value, VideoProcAmpFlags controlFlags)
{
bool ret = true; // check if source was set
if ((deviceMoniker == null) || (string.IsNullOrEmpty(deviceMoniker)))
{
throw new ArgumentException("Video source is not specified.");
} lock (sync)
{
object tempSourceObject = null; // create source device's object
try
{
tempSourceObject = FilterInfo.CreateFilter(deviceMoniker);
}
catch
{
throw new ApplicationException("Failed creating device object for moniker.");
} if (!(tempSourceObject is IAMVideoProcAmp))
{
throw new NotSupportedException("The video source does not support camera control.");
} IAMVideoProcAmp pCamControl = (IAMVideoProcAmp)tempSourceObject;
int hr = pCamControl.Set(property, value, controlFlags); ret = (hr >= ); Marshal.ReleaseComObject(tempSourceObject);
} return ret;
} /// <summary>
/// Gets the current setting of a camera property.
/// </summary>
///
/// <param name="property">Specifies the property to retrieve.</param>
/// <param name="value">Receives the value of the property.</param>
/// <param name="controlFlags">Receives the value indicating whether the setting is controlled manually or automatically</param>
///
/// <returns>Returns true on success or false otherwise.</returns>
///
/// <exception cref="ArgumentException">Video source is not specified - device moniker is not set.</exception>
/// <exception cref="ApplicationException">Failed creating device object for moniker.</exception>
/// <exception cref="NotSupportedException">The video source does not support camera control.</exception>
///
public bool GetVideoProperty(VideoProcAmpProperty property, out int value, out VideoProcAmpFlags controlFlags)
{
bool ret = true; // check if source was set
if ((deviceMoniker == null) || (string.IsNullOrEmpty(deviceMoniker)))
{
throw new ArgumentException("Video source is not specified.");
} lock (sync)
{
object tempSourceObject = null; // create source device's object
try
{
tempSourceObject = FilterInfo.CreateFilter(deviceMoniker);
}
catch
{
throw new ApplicationException("Failed creating device object for moniker.");
} if (!(tempSourceObject is IAMVideoProcAmp))
{
throw new NotSupportedException("The video source does not support camera control.");
} IAMVideoProcAmp pCamControl = (IAMVideoProcAmp)tempSourceObject;
int hr = pCamControl.Get(property, out value, out controlFlags); ret = (hr >= ); Marshal.ReleaseComObject(tempSourceObject);
} return ret;
} /// <summary>
/// Gets the range and default value of a specified camera property.
/// </summary>
///
/// <param name="property">Specifies the property to query.</param>
/// <param name="minValue">Receives the minimum value of the property.</param>
/// <param name="maxValue">Receives the maximum value of the property.</param>
/// <param name="stepSize">Receives the step size for the property.</param>
/// <param name="defaultValue">Receives the default value of the property.</param>
/// <param name="controlFlags">Receives a member of the <see cref="CameraControlFlags"/> enumeration, indicating whether the property is controlled automatically or manually.</param>
///
/// <returns>Returns true on success or false otherwise.</returns>
///
/// <exception cref="ArgumentException">Video source is not specified - device moniker is not set.</exception>
/// <exception cref="ApplicationException">Failed creating device object for moniker.</exception>
/// <exception cref="NotSupportedException">The video source does not support camera control.</exception>
///
public bool GetVideoPropertyRange(VideoProcAmpProperty property, out int minValue, out int maxValue, out int stepSize, out int defaultValue, out VideoProcAmpFlags controlFlags)
{
bool ret = true; // check if source was set
if ((deviceMoniker == null) || (string.IsNullOrEmpty(deviceMoniker)))
{
throw new ArgumentException("Video source is not specified.");
} lock (sync)
{
object tempSourceObject = null; // create source device's object
try
{
tempSourceObject = FilterInfo.CreateFilter(deviceMoniker);
}
catch
{
throw new ApplicationException("Failed creating device object for moniker.");
} if (!(tempSourceObject is IAMVideoProcAmp))
{
throw new NotSupportedException("The video source does not support camera control.");
} IAMVideoProcAmp pCamControl = (IAMVideoProcAmp)tempSourceObject;
int hr = pCamControl.GetRange(property, out minValue, out maxValue, out stepSize, out defaultValue, out controlFlags); ret = (hr >= ); Marshal.ReleaseComObject(tempSourceObject);
} return ret;
}
VideoProcAmpProperty.cs枚举对象，放在VideoCaptureDevice.cs同目录下
// AForge Direct Show Library
// AForge.NET framework
// http://www.aforgenet.com/framework/
//
// Copyright © AForge.NET, 2009-2013
// contacts@aforgenet.com
// namespace AForge.Video.DirectShow
{
using System; /// <summary>
/// The enumeration specifies a setting on a camera.
/// </summary>
public enum VideoProcAmpProperty
{
/// <summary>
/// Brightness control.
/// </summary>
Brightness = , /// <summary>
/// Contrast control.
/// </summary>
Contrast, /// <summary>
/// Hue control.
/// </summary>
Hue, /// <summary>
/// Saturation control.
/// </summary>
Saturation, /// <summary>
/// Sharpness control.
/// </summary>
Sharpness, /// <summary>
/// Gamma control.
/// </summary>
Gamma, /// <summary>
/// ColorEnable control.
/// </summary>
ColorEnable, /// <summary>
/// WhiteBalance control.
/// </summary>
WhiteBalance, /// <summary>
/// BacklightCompensation control.
/// </summary>
BacklightCompensation, /// <summary>
/// Gain control.
/// </summary>
Gain
} /// <summary>
/// The enumeration defines whether a camera setting is controlled manually or automatically.
/// </summary>
[Flags]
public enum VideoProcAmpFlags
{
/// <summary>
/// No control flag.
/// </summary>
None = 0x0, /// <summary>
/// Auto control Flag.
/// </summary>
Auto = 0x0001, /// <summary>
/// Manual control Flag.
/// </summary>
Manual = 0x0002
}
}
生成dll添加引用就可以了
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