How to output PCM data in MFT - ms-media-foundation

Question

Now I have create an ogg decoder in media foundation.
I have decode the ogg data to PCM data in IMFTransform::ProcessOutput.
but I cannot play the PCM data, so now how to play the pcm data?
This is my ProcessOutput code:
HRESULT OggDecoder:: ProcessOutput(
DWORD dwFlags, DWORD cOutputBufferCount,
MFT_OUTPUT_DATA_BUFFER *pOutputSamples, // one per stream
DWORD *pdwStatus )
{
if (dwFlags != 0)
{
return E_INVALIDARG;
}
if (pOutputSamples == NULL || pdwStatus == NULL)
{
return E_POINTER;
}
// Must be exactly one output buffer.
if (cOutputBufferCount != 1)
{
return E_INVALIDARG;
}
// It must contain a sample.
if (pOutputSamples[0].pSample == NULL)
{
return E_INVALIDARG;
}
EnterCriticalSection(&m_critSec);
HRESULT hr = S_OK;
DWORD cbData = 0;
IMFMediaBuffer *pOutput = NULL;
// If we don't have an input sample, we need some input before
// we can generate any output.
if (!HasPendingOutput())
{
hr = MF_E_TRANSFORM_NEED_MORE_INPUT;
}
// Get the output buffer.
if (SUCCEEDED(hr))
{
hr = pOutputSamples[0].pSample->GetBufferByIndex(0, &pOutput);
}
if (SUCCEEDED(hr))
{
hr = pOutput->GetMaxLength(&cbData);
}
if (SUCCEEDED(hr))
{
BYTE* pPCM=NULL;
pOutputBuffer->Lock(&pPCM,NULL,NULL);
GetPCMData(&pPCM); // decode audio data here
pOutputBuffer->SetCurrentLength(nLength);
pOutputSamples[0].pSample->SetSampleTime(sampleTime);
pOutputSamples[0].pSample->SetSampleDuration(sampleDuration);
pOutputBuffer->Unlock();
}
SafeRelease(&pOutput);
LeaveCriticalSection(&m_critSec);
return hr;
}
Is there I missing something or what' wrong with this code.
thanks.

Answer 1

if you use topoedit.exe for debug, it can add one resampler DMO automatically which is a DMO for converting pcm to float format.
you can write the player app, and create the topology by youself, and then you add the resamplyer dmo node.