How To Determine Per-Client Bandwidth Usage with the Windows Media Services 9 Series SDK (824088)

MORE INFORMATION

To determine the most accurate per-client bandwidth statistics in Windows Media Services 9 Series, you must define the following two presentation context values. You must add these values to either a header file in the project or to WmsContextNames.h.

// Type: long
// Description: Bandwidth allocated.
DEFINE_NAME_AND_HINT( WMS_PRESENT_ALLOCATED_BANDWIDTH, "WMS_PRESENT_ALLOCATED_BANDWIDTH", 30 )

// Type: long
// Description: Bandwidth allocated by network sink.
DEFINE_NAME_AND_HINT( WMS_PRESENT_BANDWIDTH_ALLOCATED_BY_NETWORKSINK, "WMS_PRESENT_BANDWIDTH_ALLOCATED_BY_NETWORKSINK", 48)

After you have added the presentation context values, you can use the client's presentation context to quickly determine the total bandwidth usage by retrieving both values and then adding the totals together. The following code example shows how to do this:

// Declare variables.
long lSinkAllocatedBandwidth = 0;
long lDatapathAllocatedBandwidth = 0;
long lTotalBandwidth = 0;

hr = pPresentationContext->GetLongValue(
                        WMS_PRESENT_BANDWIDTH_ALLOCATED_BY_NETWORKSINK,
                        WMS_PRESENT_BANDWIDTH_ALLOCATED_BY_NETWORKSINK_ID,
                        &lSinkAllocatedBandwidth,
                        0);
if( FAILED( hr ) )
{
   hr = S_OK;
   lSinkAllocatedBandwidth = 0;
}

hr = pPresentationContext->GetLongValue(
                       WMS_PRESENT_ALLOCATED_BANDWIDTH,
                       WMS_PRESENT_ALLOCATED_BANDWIDTH_ID,
                       &lDatapathAllocatedBandwidth,
                       0);
if( FAILED( hr ) )
{
   hr = S_OK;
   lDatapathAllocatedBandwidth = 0;
}

lTotalBandwidth = lSinkAllocatedBandwidth + lDatapathAllocatedBandwidth;