This example shows how to add stream scripts from a capture graph.
#define MAKE_MEDIA_PATH(pFileName) (TEXT("C:\\LEADTOOLS 21\\Media\\")TEXT(pFileName))
void CreateScriptStream(IltmmCapture *pCapture)
{
HRESULT hr = S_OK;
IUnknown *punk;
IltmmWMScript *pWMScript;
// source and target path names
BSTR bstrTarget = SysAllocString(MAKE_MEDIA_PATH("source_script.wmv"));
// set the source, target and WMV target formats for our conversion
hr = SelectCaptureDevices(pCapture);
if (FAILED(hr))
{
MessageBox(NULL, L"Unable to select capture devices", L"WMScripting Example", MB_OK);
return;
}
pCapture->put_TargetFile(bstrTarget);
pCapture->put_TargetFormat(ltmmCapture_TargetFormat_WMV_Mux);
// free the BSTR
SysFreeString(bstrTarget);
// get the target object
pCapture->GetSubObject(ltmmCapture_Object_TargetFilter, &punk);
if (punk)
{
// get the WMScript object
punk->QueryInterface(IID_IltmmWMScript, (void**)&pWMScript);
if (pWMScript)
{
WCHAR szTemp[128];
double scriptTime;
BSTR bstrScriptCmd;
// turn off stream scripts and remove any header scripts
pWMScript->put_EnableScriptStream(VARIANT_TRUE);
pWMScript->RemoveAllHeaderScripts();
// create a sample header script (type of caption) and set it to execute @ 2 secs into capture
scriptTime = 2.0;
swprintf_s(szTemp, _countof(szTemp), L"Sample caption script at %g seconds", scriptTime);
bstrScriptCmd = SysAllocString(szTemp);
// add the header script
hr = pWMScript->WriteScriptStream(L"caption", bstrScriptCmd, scriptTime);
// free the bstr
SysFreeString(bstrScriptCmd);
// now close the script stream
hr = pWMScript->CloseScriptStream();
pWMScript->Release();
}
// if all is well, run the capture now
if (SUCCEEDED(hr))
hr = pCapture->StartCapture(ltmmCapture_Mode_VideoAndAudio);
punk->Release();
}
}
BOOL SelectDeviceLike(IltmmDevices *pDevices, LPTSTR szDevSrch)
{
BOOL bFound = FALSE;
long i, count = 0;
pDevices->put_Selection(-1);
pDevices->get_Count(&count);
for(i = 0; i < count; i++)
{
IltmmDevice *pDevice;
BSTR name;
pDevices->Item(i, &pDevice);
if (pDevice)
{
// get the friendly name for comparisson check
pDevice->get_FriendlyName(&name);
// if the device name contains our search string, select it
if (!wcsstr(name, szDevSrch))
{
pDevices->put_Selection(i);
pDevice->Release();
SysFreeString(name);
bFound = TRUE;
break;
}
SysFreeString(name);
pDevice->Release();
pDevice = NULL;
}
}
return bFound;
}
HRESULT SelectCaptureDevices(IltmmCapture *pCapture)
{
IltmmDevices *pDevices;
BOOL bSelected = FALSE;
pCapture->get_VideoDevices(&pDevices);
if (!pDevices)
return E_FAIL;
bSelected = SelectDeviceLike(pDevices, L"Logitech");
pDevices->Release();
pDevices = NULL;
if (!bSelected)
return E_FAIL;
bSelected = FALSE;
pCapture->get_AudioDevices(&pDevices);
if (!pDevices)
return E_FAIL;
bSelected = SelectDeviceLike(pDevices, L"Logitech");
pDevices->Release();
if (!bSelected)
return E_FAIL;
return S_OK;
}
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