C# Aforge设置摄像头视频属性和控制属性
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2023-10-19 13:03:29
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： 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 ......
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：
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
1 /// <summary>
2 /// sets a specified property on the camera.
3 /// </summary>
4 ///
5 /// <param name="property">specifies the property to set.</param>
6 /// <param name="value">specifies the new value of the property.</param>
7 /// <param name="controlflags">specifies the desired control setting.</param>
8 ///
9 /// <returns>returns true on success or false otherwise.</returns>
10 ///
11 /// <exception cref="argumentexception">video source is not specified - device moniker is not set.</exception>
12 /// <exception cref="applicationexception">failed creating device object for moniker.</exception>
13 /// <exception cref="notsupportedexception">the video source does not support camera control.</exception>
14 ///
15 public bool setvideoproperty(videoprocampproperty property, int value, videoprocampflags controlflags)
16 {
17 bool ret = true;
18
19 // check if source was set
20 if ((devicemoniker == null) || (string.isnullorempty(devicemoniker)))
21 {
22 throw new argumentexception("video source is not specified.");
23 }
24
25 lock (sync)
26 {
27 object tempsourceobject = null;
28
29 // create source device's object
30 try
31 {
32 tempsourceobject = filterinfo.createfilter(devicemoniker);
33 }
34 catch
35 {
36 throw new applicationexception("failed creating device object for moniker.");
37 }
38
39 if (!(tempsourceobject is iamvideoprocamp))
40 {
41 throw new notsupportedexception("the video source does not support camera control.");
42 }
43
44 iamvideoprocamp pcamcontrol = (iamvideoprocamp)tempsourceobject;
45 int hr = pcamcontrol.set(property, value, controlflags);
46
47 ret = (hr >= 0);
48
49 marshal.releasecomobject(tempsourceobject);
50 }
51
52 return ret;
53 }
54
55 /// <summary>
56 /// gets the current setting of a camera property.
57 /// </summary>
58 ///
59 /// <param name="property">specifies the property to retrieve.</param>
60 /// <param name="value">receives the value of the property.</param>
61 /// <param name="controlflags">receives the value indicating whether the setting is controlled manually or automatically</param>
62 ///
63 /// <returns>returns true on success or false otherwise.</returns>
64 ///
65 /// <exception cref="argumentexception">video source is not specified - device moniker is not set.</exception>
66 /// <exception cref="applicationexception">failed creating device object for moniker.</exception>
67 /// <exception cref="notsupportedexception">the video source does not support camera control.</exception>
68 ///
69 public bool getvideoproperty(videoprocampproperty property, out int value, out videoprocampflags controlflags)
70 {
71 bool ret = true;
72
73 // check if source was set
74 if ((devicemoniker == null) || (string.isnullorempty(devicemoniker)))
75 {
76 throw new argumentexception("video source is not specified.");
77 }
78
79 lock (sync)
80 {
81 object tempsourceobject = null;
82
83 // create source device's object
84 try
85 {
86 tempsourceobject = filterinfo.createfilter(devicemoniker);
87 }
88 catch
89 {
90 throw new applicationexception("failed creating device object for moniker.");
91 }
92
93 if (!(tempsourceobject is iamvideoprocamp))
94 {
95 throw new notsupportedexception("the video source does not support camera control.");
96 }
97
98 iamvideoprocamp pcamcontrol = (iamvideoprocamp)tempsourceobject;
99 int hr = pcamcontrol.get(property, out value, out controlflags);
100
101 ret = (hr >= 0);
102
103 marshal.releasecomobject(tempsourceobject);
104 }
105
106 return ret;
107 }
108
109 /// <summary>
110 /// gets the range and default value of a specified camera property.
111 /// </summary>
112 ///
113 /// <param name="property">specifies the property to query.</param>
114 /// <param name="minvalue">receives the minimum value of the property.</param>
115 /// <param name="maxvalue">receives the maximum value of the property.</param>
116 /// <param name="stepsize">receives the step size for the property.</param>
117 /// <param name="defaultvalue">receives the default value of the property.</param>
118 /// <param name="controlflags">receives a member of the <see cref="cameracontrolflags"/> enumeration, indicating whether the property is controlled automatically or manually.</param>
119 ///
120 /// <returns>returns true on success or false otherwise.</returns>
121 ///
122 /// <exception cref="argumentexception">video source is not specified - device moniker is not set.</exception>
123 /// <exception cref="applicationexception">failed creating device object for moniker.</exception>
124 /// <exception cref="notsupportedexception">the video source does not support camera control.</exception>
125 ///
126 public bool getvideopropertyrange(videoprocampproperty property, out int minvalue, out int maxvalue, out int stepsize, out int defaultvalue, out videoprocampflags controlflags)
127 {
128 bool ret = true;
129
130 // check if source was set
131 if ((devicemoniker == null) || (string.isnullorempty(devicemoniker)))
132 {
133 throw new argumentexception("video source is not specified.");
134 }
135
136 lock (sync)
137 {
138 object tempsourceobject = null;
139
140 // create source device's object
141 try
142 {
143 tempsourceobject = filterinfo.createfilter(devicemoniker);
144 }
145 catch
146 {
147 throw new applicationexception("failed creating device object for moniker.");
148 }
149
150 if (!(tempsourceobject is iamvideoprocamp))
151 {
152 throw new notsupportedexception("the video source does not support camera control.");
153 }
154
155 iamvideoprocamp pcamcontrol = (iamvideoprocamp)tempsourceobject;
156 int hr = pcamcontrol.getrange(property, out minvalue, out maxvalue, out stepsize, out defaultvalue, out controlflags);
157
158 ret = (hr >= 0);
159
160 marshal.releasecomobject(tempsourceobject);
161 }
162
163 return ret;
164 }
videoprocampproperty.cs枚举对象，放在videocapturedevice.cs同目录下
1 // aforge direct show library
2 // aforge.net framework
3 // http://www.aforgenet.com/framework/
4 //
5 // copyright © aforge.net, 2009-2013
6 // contacts@aforgenet.com
7 //
8
9 namespace aforge.video.directshow
10 {
11 using system;
12
13 /// <summary>
14 /// the enumeration specifies a setting on a camera.
15 /// </summary>
16 public enum videoprocampproperty
17 {
18 /// <summary>
19 /// brightness control.
20 /// </summary>
21 brightness = 0,
22
23 /// <summary>
24 /// contrast control.
25 /// </summary>
26 contrast,
27
28 /// <summary>
29 /// hue control.
30 /// </summary>
31 hue,
32
33 /// <summary>
34 /// saturation control.
35 /// </summary>
36 saturation,
37
38 /// <summary>
39 /// sharpness control.
40 /// </summary>
41 sharpness,
42
43 /// <summary>
44 /// gamma control.
45 /// </summary>
46 gamma,
47
48 /// <summary>
49 /// colorenable control.
50 /// </summary>
51 colorenable,
52
53 /// <summary>
54 /// whitebalance control.
55 /// </summary>
56 whitebalance,
57
58 /// <summary>
59 /// backlightcompensation control.
60 /// </summary>
61 backlightcompensation,
62
63 /// <summary>
64 /// gain control.
65 /// </summary>
66 gain
67 }
68
69 /// <summary>
70 /// the enumeration defines whether a camera setting is controlled manually or automatically.
71 /// </summary>
72 [flags]
73 public enum videoprocampflags
74 {
75 /// <summary>
76 /// no control flag.
77 /// </summary>
78 none = 0x0,
79
80 /// <summary>
81 /// auto control flag.
82 /// </summary>
83 auto = 0x0001,
84
85 /// <summary>
86 /// manual control flag.
87 /// </summary>
88 manual = 0x0002
89 }
90 }
生成dll添加引用就可以了
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