由于3G手机应用视频电话的时候要双camera，那么就存在切换的问题，我就在开发板上进行了调试。marvell的zylonite开发板Windows Mobile6.0 BSP关于camera的驱动变化还是很明显的，采用了wince6.0的camera驱动。
找了半天才在微软的MSDN上看到了各个pdd函数的说明。整个设计的原理就是APP先停止preview，发出切换sensor的指令，驱动响应，把sensor相关的都换成另外一个sensor，然后再重新preview。首先camera的应用程序得自己写，不然双camera的切换无法在应用上修改，于是找了个camera的应用代码参考了下，居然都编译不过，晕，我不是做app的，但是又没有人帮我，只好硬着头皮看资料看代码。幸好自己也做过一点PC上的应用程序，终于看懂，原来采用WTL+directshow写的camera应用，mainframe+manager+ view+setting结构很清晰。应用程序写上如下代码：
BOOL CCameraManager::CameraSwitchSensor(CAMERA_SWITCH sensor)
{
LRESULT hr; CComPtr<IAMCameraControl> pCameraControl; long lCurrentVal,lCurrentFlags; long CameraControl_Switch=CameraControl_Flash+0xff; if(sensor>=SENSOR_MAX) return FALSE; CHK(m_pVideoCapFilter->QueryInterface(&pCameraControl)); CHK(pCameraControl->Get(CameraControl_Switch, &lCurrentVal, &lCurrentFlags)); if(lCurrentVal == sensor)
{ //return TRUE;
} CHK(pCameraControl->Set(CameraControl_Switch, sensor, CameraControl_Flags_Manual));err_exit: if( FAILED( hr )) { CCameraParam::GetCameraParam()->GetErrorlog()->WriteLog(L"Error: CCameraManager::CameraSwitchSensor"); return FALSE; } return TRUE;
}
EXTERN_CBOOLCAM_IOControl( DWORD dwContext, DWORD Ioctl, UCHAR
*
pInBufUnmapped, DWORD InBufLen, UCHAR
*
pOutBufUnmapped, DWORD OutBufLen, DWORD
*
pdwBytesTransferred )
{ DEBUGMSG( ZONE_FUNCTION, ( _T("CAM_IOControl(%08x): IOCTL:0x%x, InBuf:0x%x, InBufLen:%d, OutBuf:0x%x, OutBufLen:0x%x)"), dwContext, Ioctl, pInBufUnmapped, InBufLen, pOutBufUnmapped, OutBufLen ) ); //NKDbgPrintfW(L"CAM_IOControl 0x%x", Ioctl); UCHAR * pInBuf = NULL; UCHAR * pOutBuf = NULL; DWORD dwErr = ERROR_INVALID_PARAMETER; BOOL bRc = FALSE; if ( ( NULL == pInBufUnmapped ) || ( InBufLen < sizeof ( CSPROPERTY ) ) || ( NULL == pdwBytesTransferred ) ) { SetLastError( dwErr ); return bRc; } //All buffer accesses need to be protected by try/except pInBuf = pInBufUnmapped; pOutBuf = pOutBufUnmapped; CAMERAOPENHANDLE * pCamOpenHandle = reinterpret_cast<CAMERAOPENHANDLE *>( dwContext ); CAMERADEVICE * pCamDevice = pCamOpenHandle->pCamDevice; CSPROPERTY * pCsProp = reinterpret_cast<CSPROPERTY *>(pInBuf); if ( NULL == pCsProp ) { DEBUGMSG( ZONE_IOCTL|ZONE_ERROR, (_T("CAM_IOControl(%08x): Invalid Parameter."), dwContext ) ); return dwErr; } switch ( Ioctl ) { // Power Management Support. case IOCTL_POWER_CAPABILITIES: case IOCTL_POWER_QUERY: case IOCTL_POWER_SET: case IOCTL_POWER_GET: { NKDbgPrintfW(L"camera IOCTL_POWER+"); DEBUGMSG( ZONE_IOCTL, ( _T("CAM_IOControl(%08x): Power Management IOCTL"), dwContext ) ); __try { dwErr = pCamDevice->AdapterHandlePowerRequests(Ioctl, pInBuf, InBufLen, pOutBuf, OutBufLen, pdwBytesTransferred ); } __except ( EXCEPTION_EXECUTE_HANDLER ) { DEBUGMSG( ZONE_IOCTL, ( _T("CAM_IOControl(%08x):Exception in Power Management IOCTL"), dwContext ) ); } break; } case IOCTL_CS_PROPERTY: { DEBUGMSG( ZONE_IOCTL, ( _T("CAM_IOControl(%08x): IOCTL_CS_PROPERTY"), dwContext ) ); __try { dwErr = pCamDevice->AdapterHandleCustomRequests( pInBuf,InBufLen, pOutBuf, OutBufLen, pdwBytesTransferred ); if ( ERROR_NOT_SUPPORTED == dwErr ) { if ( TRUE == IsEqualGUID( pCsProp->Set, CSPROPSETID_Pin ) ) { dwErr = pCamDevice->AdapterHandlePinRequests( pInBuf, InBufLen, pOutBuf, OutBufLen, pdwBytesTransferred ); } else if ( TRUE == IsEqualGUID( pCsProp->Set, CSPROPSETID_VERSION ) ) { dwErr = pCamDevice->AdapterHandleVersion( pOutBuf, OutBufLen, pdwBytesTransferred ); } else if ( TRUE == IsEqualGUID( pCsProp->Set, PROPSETID_VIDCAP_VIDEOPROCAMP ) ) { dwErr = pCamDevice->AdapterHandleVidProcAmpRequests( pInBuf,InBufLen, pOutBuf, OutBufLen, pdwBytesTransferred ); } else if ( TRUE == IsEqualGUID( pCsProp->Set, PROPSETID_VIDCAP_CAMERACONTROL ) ) { dwErr = pCamDevice->AdapterHandleCamControlRequests( pInBuf,InBufLen, pOutBuf, OutBufLen, pdwBytesTransferred ); } else if ( TRUE == IsEqualGUID( pCsProp->Set, PROPSETID_VIDCAP_VIDEOCONTROL ) ) { dwErr = pCamDevice->AdapterHandleVideoControlRequests( pInBuf,InBufLen, pOutBuf, OutBufLen, pdwBytesTransferred ); } else if ( TRUE == IsEqualGUID( pCsProp->Set, PROPSETID_VIDCAP_DROPPEDFRAMES) ) { dwErr = pCamDevice->AdapterHandleDroppedFramesRequests( pInBuf,InBufLen, pOutBuf, OutBufLen, pdwBytesTransferred ); } } } __except ( EXCEPTION_EXECUTE_HANDLER ) { DEBUGMSG( ZONE_IOCTL, ( _T("CAM_IOControl(%08x):Exception in IOCTL_CS_PROPERTY"), dwContext ) ); } break; } default: { DEBUGMSG( ZONE_IOCTL, (_T("CAM_IOControl(%08x): Unsupported IOCTL code %u"), dwContext, Ioctl ) ); dwErr = ERROR_NOT_SUPPORTED; break; } } // pass back appropriate response codes SetLastError( dwErr ); return ( ( dwErr == ERROR_SUCCESS ) ? TRUE : FALSE );}
，赞一个），实现如下：
DWORD CCameraPdd::HandleAdapterCustomProperties( PUCHAR pInBuf, DWORD InBufLen, PUCHAR pOutBuf, DWORD OutBufLen, PDWORD pdwBytesTransferred )
{ typedef enum { SENSOR_FRONT, SENSOR_REAR, SENSOR_MAX, }CAMERA_SWITCH; CONST LONG CAMERACONTROL_SWITCH = CSPROPERTY_CAMERACONTROL_FLASH+0XFF; PCSPROPERTY_CAMERACONTROL_S pCsPropCamControlInput = NULL; CSPROPERTY * pCsProp = reinterpret_cast<CSPROPERTY *>(pInBuf); if( ( TRUE == IsEqualGUID( pCsProp->Set, PROPSETID_VIDCAP_CAMERACONTROL ) ) && (pCsProp->Id == CAMERACONTROL_SWITCH)) { pCsPropCamControlInput = reinterpret_cast<PCSPROPERTY_CAMERACONTROL_S>(pInBuf); switch(pCsProp->Flags) { case CSPROPERTY_TYPE_GET: break; case CSPROPERTY_TYPE_SET: if(pCsPropCamControlInput->Value == SENSOR_FRONT) { sensor=sensor_ov7660; set_video_Format(m_pModeVideoFormat, sensor); NKDbgPrintfW(L"sensor=sensor_ov7660; "); } else if((pCsPropCamControlInput->Value == SENSOR_REAR)) { sensor=sensor_ov2630; set_video_Format(m_pModeVideoFormat, sensor); NKDbgPrintfW(L"sensor=sensor_ov2630; "); } break; default: break; } return ERROR_SUCCESS; } else { DEBUGMSG( ZONE_IOCTL, ( _T("IOControl Adapter PDD: Unsupported PropertySet Request"))); return ERROR_NOT_SUPPORTED; }}
DWORD CCameraPdd::set_video_Format(PPINVIDEOFORMAT pModeVideoFormat, Sensor
*
sensor)
{ if(NULL==pModeVideoFormat || NULL==sensor) return ERROR_INVALID_TARGET_HANDLE; for (ULONG i = 0; i < m_ulCTypes; i++) { unsigned int nformats; PCS_DATARANGE_VIDEO** formats; formats = &pModeVideoFormat[i].pCsDataRangeVideo; nformats = sensor->get_formats(i, formats); pModeVideoFormat[i].ulAvailFormats = nformats; if ( NULL == pModeVideoFormat[i].pCsDataRangeVideo ) return ERROR_INSUFFICIENT_BUFFER; } for (ULONG i = 0; i < m_ulCTypes; i++) { for (ULONG j = 0; j < pModeVideoFormat[i].ulAvailFormats; j++) { PCS_VIDEOINFOHEADER pCsVideoInfoHdr; pCsVideoInfoHdr = &pModeVideoFormat[i].pCsDataRangeVideo[j]->VideoInfoHeader; camera_cfg_t* cfg = sensor->get_camera_cfg(pCsVideoInfoHdr, i); if (!cfg) NKDbgPrintfW(L"failed to get camera configuration!!!"); sensor->init_camera_cfg(cfg, i); qci_notify_formats(&cfg->qci_format); } } return ERROR_SUCCESS;}
CComPtr
<
IAMStreamConfig
>
pStremConfig; CHK(m_pCapGraphBuilder
->
FindInterface(
&
PIN_CATEGORY_CAPTURE,
0
, m_pVideoCapFilter, IID_IAMStreamConfig, (
void
**
)
&
pStremConfig)) CHK(pStremConfig
->
GetNumberOfCapabilities(
&
iCount,
&
iSize));
if
(iSize
==
sizeof
(VIDEO_STREAM_CONFIG_CAPS))
{ for (int iFormat = 0; iFormat < iCount; iFormat++) { VIDEO_STREAM_CONFIG_CAPS scc; AM_MEDIA_TYPE *pmtConfig; CHK(pStremConfig->GetStreamCaps(iFormat, &pmtConfig, (BYTE*)&scc)); if (SUCCEEDED(hr)) { if(scc.MinOutputSize.cx == pSize->cx && scc.MinOutputSize.cy == pSize->cy) { CHK(pStremConfig->SetFormat(pmtConfig)); DeleteMediaType(pmtConfig); break; } DeleteMediaType(pmtConfig); } } }
LRESULT CMainFrame::OnSwitchsensorFront(WORD
/*wNotifyCode*/
, WORD
/*wID*/
, HWND
/*hWndCtl*/
, BOOL
&
/*bHandled*/
)
{ // TODO: Add your command handler code here m_view.StopGraph(); m_view.CameraSwitchSensor(SENSOR_FRONT); m_view.SaveElectricity(TRUE); m_view.StartupCameraMode(m_view.GetCurrentCameraMode()); m_view.RunGraph(); m_view.RedrawWindow(); return 0;}
LRESULT CMainFrame::OnSwitchsensorRear(WORD
/*wNotifyCode*/
, WORD
/*wID*/
, HWND
/*hWndCtl*/
, BOOL
&
/*bHandled*/
)
{ // TODO: Add your command handler code here m_view.StopGraph(); m_view.CameraSwitchSensor(SENSOR_REAR); m_view.SaveElectricity(TRUE); m_view.StartupCameraMode(m_view.GetCurrentCameraMode()); m_view.RunGraph(); m_view.RedrawWindow(); return 0;}
这是最后的结果，过程做了很多调试，发现只有这些不能去掉。在添加一个切换的菜单时，发现居然出现不了，原来是多语言包的问题，资源和程序是分开的，用0804.MUI。在.rc文件添加
/////////////////////////////////////////////////////////////////////////////
//
//
Menu
//
IDR_MAINFRAME MENU BEGIN MENUITEM
"
拍摄
"
, IDB_CAPTUREORSTOP POPUP
"
菜单
"
BEGIN POPUP
"切换摄像头" BEGIN MENUITEM "前置", ID_SWITCHSENSOR_FRONT MENUITEM "后置"
, ID_SWITCHSENSOR_REAR END ENDEND
还有很多bsp和directshow的细节问题太多，就不写了，主要是说明下思路，现在还有个问题就是切换的太慢了，要5-9秒钟，有空看看瓶颈在哪里，优化下看看。去掉了些调试功能，好像快了一个2秒一个4秒。
转自：http://www.cnblogs.com/lucky-apple/archive/2008/05/24/1206350.html
