1.4.4 VideoOperate类

VideoOperate类主要封装了操作视频采集卡的各种枚举及方法，由于要调用Sa7134Capture.dll动态链接库，所以首先要引用命名空间using System.Runtime.InteropServices。封装Sa7134Capture.dll动态链接库中各种枚举及方法的关键代码如下：

例程09 代码位置：光盘\TM\01\VWMS\VWMS\CommonClass\VideoOperate.cs

#region 视频采集卡中的枚举

public enum DISPLAYTRANSTYPE

{

NOT_DISPLAY = 0,

PCI_VIEDOMEMORY = 1,

PCI_MEMORY_VIDEOMEMORY = 2

}

//视频预览和视频捕捉数据流格式，目前版本只支持UUY2格式

public enum COLORFORMAT

{

RGB32 = 0x0,

RGB24 = 0x1,

RGB16 = 0x2,

RGB15 = 0x3,

YUY2 = 0x4,

TYUV = 0x5,

8 = 0x6,

GB8 = 0x7,

L422 = 0x8,

L411 = 0x9,

UV12 = 0xA,

UV9 = 0xB,

AW = 0xE

}

/*视频预览及视频捕获的显示属性，其中：

BRIGHTNESS为亮度，value范围：0~255，最佳：80

CONTRAST为对比度，value范围：-128~127，最佳：x44

SATURATION为饱和度，value范围：-128~127，最佳：x40

HUE为色度，value范围：-128~127，最佳：x0

只有当COLORDEVICETYPE等于COLOR_DECODER时才有效

SHARPNESS为锐度，value范围：-8~7，最佳：x0

只有当COLORDEVICETYPE等于COLOR_DECODER时才有效

*/

public enum COLORCONTROL

{

BRIGHTNESS = 0,

CONTRAST = 1,

SATURATION = 2,

HUE = 3,

SHARPNESS = 4

}

/*显示设备的显示属性，其中：

COLOR_DECODER为解码器的显示属性，它会影响视频预览和视频捕获的显示属性

COLOR_PREVIEW为视频预览的显示属性

COLOR_CAPTURE为视频捕获的显示属性

*/

pblic enum COLORDEVICETYPE

{

COLOR_DECODER = 0,

COLOR_PREVIEW = 1,

COLOR_CAPTURE = 2,

}

/*视频捕获方式，其中：

CAP_NULL_STREAM 捕获无效

CAP_ORIGIN_STREAM 捕获为原始流回调

CAP_MPEG4_STREAM 捕获为MPEG4

*/

public enum CAPMODEL

{

CAP_NULL_STREAM = 0,

CAP_ORIGIN_STREAM = 1,

CAP_MPEG4_STREAM = 2,

}

/*音视频MPEG4捕获方式，只有CAPMODEL等于CAP_MPEG4_STREAM时有效，其中：

MPEG4_AVIFILE_ONLY 存为MPEG4文件

MPEG4_CALLBACK_ONLY MPEG数据回调

MPEG4_AVIFILE_CALLBACK 存为MPEG文件并回调

*/

public enum MP4MODEL

{

MPEG4_AVIFILE_ONLY = 0,

MPEG4_CALLBACK_ONLY = 1,

MPEG4_AVIFILE_CALLBACK = 2,

}

/*MPEG4_XVID压缩模式，其中：

XVID_CBR_MODE （固定码率模式）

XVID_VBR_MODE （动态码率模式）

*/

public enum COMPRESSMODE

{

XVID_CBR_MODE = 0,

XVID_VBR_MODE = 1,

}

/*视频源的输入频率，其中：

FIELD_FREQ_50HZ 50HZ，绝对多数为PAL制式

FIELD_FREQ_60HZ 60HZ，绝对多数为NTSC制式

FIELD_FREQ_0HZ，无信号

*/

public enum eFieldFrequency

{

FIELD_FREQ_50HZ = 0,

FIELD_FREQ_60HZ = 1,

FIELD_FREQ_0HZ = 2,

}

/*电平状态，其中：

HIGH_VOLTAGE为高电平

LOW_VOLTAGE为低电平

*/

public enum eVOLTAGELEVEL

{

HIGH_VOLTAGE = 0,

LOW_VOLTAGE = 1,

}

#endregion

#region 视频采集卡中的API函数

//初始化系统资源

[DllImport("Sa7134Capture.dll", EntryPoint = "VCAInitSdk")]

public extern static bool VCAInitSdk(IntPtr hWndMain, DISPLAYTRANSTYPE eDispTransType, bool bLnitAuDev);

//释放系统资源

[DllImport("Sa7134Capture.dll", EntryPoint = "VCAUnInitSdk")]

public extern static void VCAUnInitSdk();

//打开指定卡号的设备，分配相应系统资源

[DllImport("Sa7134Capture.dll", EntryPoint = "VCAOpenDevice")]

public extern static bool VCAOpenDevice(Int32 dwCard, IntPtr hPreviewWnd);

//关闭指定卡号的设备，释放相应系统资源

[DllImport("Sa7134Capture.dll", EntryPoint = "VCACloseDevice")]

public extern static bool VCACloseDevice(Int32 dwCard);

//返回系统当中卡号数量，即为SAA7134硬件数目，为0时表示没有设备存在

[DllImport("Sa7134Capture.dll", EntryPoint = "VCAGetDevNum")]

public extern static int VCAGetDevNum();

//开始视频预览

[DllImport("Sa7134Capture.dll", EntryPoint = "VCAStartVideoPreview")]

public extern static bool VCAStartVideoPreview(Int32 dwCard);

//停止视频预览

[DllImport("Sa7134Capture.dll", EntryPoint = "VCAStopVideoPreview")]

public extern static bool VCAStopVideoPreview(Int32 dwCard);

//更新视频预览

[DllImport("Sa7134Capture.dll", EntryPoint = "VCAUpdateVideoPreview")]

public extern static bool VCAUpdateVideoPreview(Int32 dwCard, IntPtr hPreviewWnd);

//更新overlay窗口，当overlay窗口句柄改变或尺寸、位置改变时调用，overlay窗口就是包含

//多路显示小窗口的大窗口，overlay窗口必须有一个，多路显示小窗口必须包含在其内部

[DllImport("Sa7134Capture.dll", EntryPoint = "VCAUpdateOverlayWnd")]

public extern static bool VCAUpdateOverlayWnd(IntPtr hOverlayWnd);

//保存快照为JPEG文件

[DllImport("Sa7134Capture.dll", EntryPoint = "VCASaveAsJpegFile")]

public extern static bool VCASaveAsJpegFile(Int32 dwCard, string lpFileName, Int32 dwQuality);

//保存快照为BMP文件

[DllImport("Sa7134Capture.dll", EntryPoint = "VCASaveAsBmpFile")]

public extern static bool VCASaveAsBmpFile(Int32 dwCard, string lpFileName);

//开始视频捕获

[DllImport("Sa7134Capture.dll", EntryPoint = "VCAStartVideoCapture")]

public extern static bool VCAStartVideoCapture(Int32 dwCard, CAPMODEL enCapMode, MP4MODEL enMp4Mode, string lpFileName);

//停止视频捕获

[DllImport("Sa7134Capture.dll", EntryPoint = "VCAStopVideoCapture")]

public extern static bool VCAStopVideoCapture(Int32 dwCard);

//设置视频捕获尺寸，dwWidth和dwHeight最好为16的倍数，否则，动态检测为16×16的一个检测小块，检测将会不准确

[DllImport("Sa7134Capture.dll", EntryPoint = "VCASetVidCapSize")]

public extern static bool VCASetVidCapSize(Int32 dwCard, Int32 dwWidth, Int32 dwHeight);

//得到视频捕获尺寸

[DllImport("Sa7134Capture.dll", EntryPoint = "VCAGetVidCapSize")]

public extern static bool VCAGetVidCapSize(Int32 dwCard, Int32 dwWidth, Int32 dwHeight);

//设置视频捕获频率

[DllImport("Sa7134Capture.dll", EntryPoint = "VCASetVidCapFrameRate")]

public extern static bool VCASetVidCapFrameRate(Int32 dwCard, Int32 dwFrameRate, bool bFrameRateReduction);

//设置MPEG压缩的位率

[DllImport("Sa7134Capture.dll", EntryPoint = "VCASetBitRate")]

public extern static bool VCASetBitRate(Int32 dwCard, Int32 dwBitRate);

//设置MPEG压缩的关键帧间隔，必须大于等于帧率

[DllImport("Sa7134Capture.dll", EntryPoint = "VCASetKeyFrmInterval")]

public extern static bool VCASetKeyFrmInterval(Int32 dwCard, Int32 dwKeyFrmInterval);

//设置MPEG4_XVID压缩的质量

[DllImport("Sa7134Capture.dll", EntryPoint = "VCASetXVIDQuality")]

public extern static bool VCASetXVIDQuality(Int32 dwCard, Int32 dwQuantizer, Int32 dwMotionPrecision);

//设置MPEG4_XVID压缩的模式

[DllImport("Sa7134Capture.dll", EntryPoint = "VCASetXVIDCompressMode")]

public extern static bool VCASetXVIDCompressMode(Int32 dwCard, COMPRESSMODE enCompessMode);

//设置视频颜色属性，它将影响视频预览和视频捕获的显示属性

[DllImport("Sa7134Capture.dll", EntryPoint = "VCASetVidDeviceColor")]

public extern static bool VCASetVidDeviceColor(Int32 dwCard, COLORCONTROL enCtlType, Int32 dwValue);

//得到视频源输入频率，即可得到视频源输入制式

[DllImport("Sa7134Capture.dll", EntryPoint = "VCAGetVidFieldFrq")]

public extern static bool VCAGetVidFieldFrq(Int32 dwCard, eFieldFrequency eVidSourceFieldRate);

//初始化视频设备，当视频不显示，只需视频录像获得音频处理时，或通过VCAInitSdk()函数已经初始化完成，

//可以不初始化

[DllImport("Sa7134Capture.dll", EntryPoint = "VCAInitVidDev")]

public extern static bool VCAInitVidDev();

#endregion