#include "ltmm.h"
#include "Filters/ILMMpg2MxT.h"
#include <time.h>
HRESULT UseFilterCache_Example (IltmmCapture* pCapture)
{
HRESULT hr;
IltmmDevices* devices = NULL;
IltmmCompressors* compressors = NULL;
IltmmTargetFormats* pformats = NULL;
IltmmTargetFormat* pformat = NULL;
IUnknown* pUnknown = NULL;
ILMMpg2MxT* pMpgMux = NULL;
long lIndex = 0;
// mpeg2 compressor
static TCHAR SZ_MPEG2_Compressor[] = "@device:sw:{33D9A760-90C8-11D0-BD43-00A0C911CE86}\\LEAD MPEG2 Encoder (3.0)";
// get the video devices collection
hr = m_capture->get_VideoDevices(&devices);
if(FAILED(hr))
return hr;
// select the capture device
hr = devices->put_Selection(0); // Use a different video device if you want
// release the video devices collection object
devices->Release();
if(FAILED(hr))
return hr;
// get the video compressors collection
hr = m_capture->get_VideoCompressors(&compressors);
if(FAILED(hr))
return hr;
USES_CONVERSION;
// find mpeg2 compressor
hr = compressors->Find(T2OLE(SZ_MPEG2_Compressor), &lIndex);
if(FAILED(hr) || lIndex == -1)
{
// release the compressors collection object
compressors->Release();
return S_FALSE;
}
// set the video compressor (only if the capture device is not already capturing compressed video)
compressors->put_Selection(lIndex);
// release the compressors collection object
compressors->Release();
// set the target output file
BSTR bstr = SysAllocString(L"c:\\CaptureKLV.avi");
m_capture->put_TargetFile(bstr);
SysFreeString(bstr);
// just 10 seconds of capture time
m_capture->put_UseTimeLimit (VARIANT_TRUE);
m_capture->put_TimeLimit(10);
// get the target formats collection
hr = m_capture->get_TargetFormats(&pformats);
if(FAILED(hr))
return hr;
// get the MPEG2Transport target format object
hr = pformats->Item(ltmmCapture_TargetFormat_MPEG2_TRANSPORT, &pformat);
if(FAILED(hr))
{
// release the formats collection object
pformats->Release();
return hr;
}
// IN a capture situation
// in order to get the mux in a capture situation, set the UseFilterCache property for the target format to TRUE
// This tells the toolkit to create a Mux object and keep it around when building or rebuilding graphs
// enable filter cache
hr = pformat->put_UseFilterCache(VARIANT_TRUE);
if(FAILED(hr))
{
// release the format and collection objects
pformat->Release();
pformats->Release();
return hr;
}
// select MPEG2Transport target format
hr = m_capture->put_TargetFormat (ltmmCapture_TargetFormat_MPEG2_TRANSPORT);
if(FAILED(hr))
return hr;
// get the multiplexer object for this format
hr = pformat->GetCacheObject(ltmmTargetFormat_Object_Mux, &pUnknown);
if(FAILED(hr))
{
// release the format and collection objects
pformat->Release();
pformats->Release();
return hr;
}
// release the format and collection objects
pformat->Release();
pformats->Release();
hr = pUnknown->QueryInterface(IID_ILMMpg2MxT, (void **)&pMpgMux);
pUnknown->Release();
if(FAILED(hr))
return hr;
if(pMpgMux)
{
pMpgMux->put_PrivateDataPID(0x70);
pMpgMux->put_PrivateDataFormatID(0x41564c4b);
pMpgMux->put_EnablePrivateData(VARIANT_TRUE);
}
// release the multiplexer object
pMpgMux->Release();
// start capture
hr = m_capture->StartCapture(ltmmCapture_Mode_Video);
if(FAILED(hr))
return hr;
hr = WriteKLVData(pMpgMux);
return hr;
}
HRESULT WriteKLVData (ILMMpg2MxT* pMpgMux )
{
HRESULT hr = S_OK;
time_t basetime;
time(&basetime);
unsigned __int64 timestamp = ((unsigned __int64) basetime * 1000000);
// get the mux builder
ILMKlvBuilder* builder;
hr = pMpgMux->get_KlvBuilder(&builder);
if(FAILED(hr))
goto abort;
// clear out any existing data
builder->Clear();
// write the UDS timestamp
hr = builder->InsertUInt64(-1L, CComBSTR(L"06 0E 2B 34 01 01 01 03 07 02 01 01 01 05 00 00"), timestamp);
if(FAILED(hr))
{
builder->Release();
goto abort;
}
// get KLV data
VARIANT v;
VariantInit(&v);
hr = builder->GetData(&v);
if(FAILED(hr))
{
builder->Release();
goto abort;
}
// write one KLV data at the beginning
hr = pMpgMux->WritePrivateData(Mpg2MxT_WriteFlag_PTSValid | Mpg2MxT_WriteFlag_PTSInSeconds, 1.0, v, -1);
VariantClear(&v);
if(FAILED(hr))
{
builder->Release();
goto abort;
}
builder->Release();
abort:
// close the stream
pMpgMux->ClosePrivateData();
return hr;
}
Help Collections
Raster .NET | C API | C++ Class Library | HTML5 JavaScript
Document .NET | C API | C++ Class Library | HTML5 JavaScript
Medical .NET | C API | C++ Class Library | HTML5 JavaScript
Medical Web Viewer .NET
Multimedia
Direct Show .NET | C API | Filters
Media Foundation .NET | C API | Transforms
Supported Platforms
.NET, Java, Android, and iOS/macOS Assemblies
Imaging, Medical, and Document
C API/C++ Class Libraries
Imaging, Medical, and Document
HTML5 JavaScript Libraries
Imaging, Medical, and Document
Your email has been sent to support! Someone should be in touch! If your matter is urgent please come back into chat.
Chat Hours:
Monday - Friday, 8:30am to 6pm ET
Thank you for your feedback!
Please fill out the form again to start a new chat.
All agents are currently offline.
Chat Hours:
Monday - Friday
8:30AM - 6PM EST
To contact us please fill out this form and we will contact you via email.