NOTICE: This Q&A below is only for directshow sdk.
A: 1.0.13010.20180926
A: For normal directshow application development, pure directshow programming is sufficient. For advanced directshow application development (such as camera control GUI customization), COM interfaces in toupcam_dshow.h are available. A how-to-use C++ source code sample demodshow.zip is shipped within toupcamsdk.zip as well. There is also a sample program source code amcap.zip (provided by Microsoft) in the samples directory.
A: No, this is not a bug, it is inherent. If you want to avoid this, you may use the native C API.
A: No, this is not a bug, it is by design. The output media subtype is always MEDIASUBTYPE_RGB24 even the bitdepth is greater than 8 or for mono cameras. After all, there is not MEDIASUBTYPE_RGB48 in directshow.
A: 1. demodshow: everything about directshow is in dshow.h and dshow.cpp. This sample uses mfc for the UI.
2. amcap: a sample comes from Microsoft.
A: Microsoft's MSDN is the most complete reference of DirectShow. You can access it at http://msdn.microsoft.com/en-us/library/dd375454%28v=VS.85%29.aspx
Filter interfaces | IBaseFilter ISpecifyPropertyPages IAMFilterMiscFlags IAMVideoControl (Still capture capable models) IAMVideoProcAmp IVideoProcAmp ICameraControl IAMCameraControl IToupcam (see toupcam_dshow.h) IToupcamSerialNumber IToupcamStillImage (Still capture capable models) IToupcamSerialNumber IToupcamVersion IToupcamST4 |
Output pin interfaces Preview or Still |
IPin IQualityControl IAMStreamConfig IKsPropertySet ISpecifyPropertyPages IAMVideoProcAmp IVideoProcAmp ICameraControl IAMCameraControl IToupcam (see toupcam_dshow.h) IToupcamSerialNumber IToupcamStillImage (Still capture capable models) IToupcamSerialNumber IToupcamVersion IToupcamST4 |
Output Pin Media Types | MEDIATYPE_Video (always RGB24) MEDIASUBTYPE_NULL FORMAT_VideoInfo |
A:
Category | Functions | Range or function to get the range | Default |
Video Resolution | put_Size get_Size put_eSize get_eSize |
get_ResolutionNumber get_Resolution |
model specific |
Exposure | get_AutoExpoTarget put_AutoExpoTarget |
10~230 | 120 |
get_AutoExpoEnable put_AutoExpoEnable |
TRUE or FALSE | TRUE | |
get_ExpoTime put_ExpoTime |
get_ExpTimeRange | model specific | |
get_ExpoAGain put_ExpoAGain |
get_ExpoAGainRange | model specific | |
White Balance | get_TempTint put_TempTint |
Temp: 2000~15000 Tint: 200~2500 |
Temp = 6503 Tint = 1000 |
Color | get_Hue put_Hue |
-180~180 | 0 |
get_Saturation put_Saturation |
0~255 | 128 | |
get_Brightness put_Brightness |
-64~64 | 0 | |
get_Contrast put_Contrast |
-100~100 | 0 | |
get_Gamma put_Gamma |
20~180 | 100 | |
get_LevelRange put_LevelRange |
0~255 | Low = 0 High = 255 |
|
get_MonoMode | S_OK: mono mode S_FALSE: color mode |
model specific | |
Vignetting | get_VignetEnable put_VignetEnable |
TRUE or FALSE | FALSE |
get_VignetMidPointInt put_VignetMidPointInt |
0~100 | 50 | |
get_VignetAmountInt put_VignetAmountInt |
-100~100 | 0 | |
Misc | get_VFlip put_VFlip |
TRUE or FALSE | FALSE |
get_HZ put_HZ |
enum: 0, 1, 2 0 -> 60HZ AC 1 -> 50Hz AC 2 -> DC |
DC | |
get_Chrome put_Chrome |
TRUE or FALSE | FALSE | |
get_Speed put_Speed |
get_MaxSpeed | model specific | |
Still Image | put_StillSize get_StillSize put_eStillSize get_eStillSize |
get_StillResolutionNumber get_StillResolution |
model specific |
NOTE: Exposure time unit is microsecond.
A: Query the IToupcamStillImage interface.
A: Code example can be found in TDshowContext::get_framerate function in dshow.h and dshow.cpp of the demodshow sample project.
A: Use the IToupcamSerialNumber interface. Code example can be found in the demodshow sample project.
A: Yes, of course. This SDK is DirectShow based and can be easily integrated into your .net applications. See http://directshownet.sourceforge.net/ for more details.
There are two cases according to that the camera filter is connected or not connected.
(1) Before the camera filter is connected: firstly, use put_eSize or put_Size to set the resolution, then use put_Roi to set the ROI.
(2) After the camera filter is connected: call put_Roi to set the offset can be supported. The width and height can NOT be changed.
DShow ROI is supported since 20180824.
A: Yes, but it's something tricky. The toupcam.ax generally open the "first" camera connected to the computer. If you want open multiple instance simultaneously, we advise you to use the native API. If you truely want to open multiple instance simultaneously in directshow, please use DshowEnumCamera and DshowOpenCamera which are defined as below:
/* return value: the number of connected camera */ unsigned __stdcall DshowEnumCamera(); /* return value: the camera directshow COM object, which can be used to QueryInterface(IID_IBaseFilter, ...). When failed, NULL is returned */ /* use DshowOpenCamera(0) to open the first camera, use DshowOpenCamera(1) to open the second camera, etc */ IUnknown* __stdcall DshowOpenCamera(unsigned index); |
typedef unsigned (__stdcall *PFUN_DSHOWENUMCAMERA)(); typedef const wchar_t* (__stdcall *PFUN_DSHOWGETMODELNAME)(unsigned index); typedef IUnknown* (__stdcall *PFUN_DSHOWOPENCAMERA)(unsigned index); PFUN_DSHOWENUMCAMERA g_pDshowEnumCamera = NULL; PFUN_DSHOWGETMODELNAME g_pDshowGetModelName = NULL; PFUN_DSHOWOPENCAMERA g_pDshowOpenCamera = NULL; HMODULE g_hModuleToupcamAx = NULL; void InitToupcamAx() { if (g_hModuleToupcamAx) return; HKEY hKey = NULL; /* {EA6387A5-60C7-41D3-B058-8D90580A7BE1} is the clsid of toupcam dshow object */ if (ERROR_SUCCESS == RegOpenKeyExW(HKEY_CLASSES_ROOT, L"CLSID\\{EA6387A5-60C7-41D3-B058-8D90580A7BE1}\\InprocServer32", 0, KEY_READ, &hKey)) { wchar_t axPath[MAX_PATH + 1] = { 0 }; DWORD cbData = MAX_PATH * sizeof(wchar_t); if (ERROR_SUCCESS == RegQueryValueExW(hKey, NULL, NULL, NULL, (PBYTE)axPath, &cbData)) { /* get the full path of toupcam.ax */ g_hModuleToupcamAx = LoadLibraryW(axPath); if (g_hModuleToupcamAx) { g_pDshowEnumCamera = (PFUN_DSHOWENUMCAMERA)GetProcAddress(g_hModuleToupcamAx, "DshowEnumCamera"); g_pDshowGetModelName = (PFUN_DSHOWGETMODELNAME)GetProcAddress(g_hModuleToupcamAx, "DshowGetModelName"); g_pDshowOpenCamera = (PFUN_DSHOWOPENCAMERA)GetProcAddress(g_hModuleToupcamAx, "DshowOpenCamera"); } } RegCloseKey(hKey); } } |