Exemplo n.º 1
0
HRESULT Inpin::EndOfStream()
{
    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    if (!bool(m_pPinConnection))
        return VFW_E_NOT_CONNECTED;

#ifdef _DEBUG
    odbgstream os;
    os << "webmvorbisdecoder::inpin::EOS" << endl;
#endif

    if (m_bFlush)
        return S_FALSE;  //?

    m_bEndOfStream = true;

    m_buffers.push_back(0);

    const BOOL b = SetEvent(m_hSamples);
    assert(b);

    return S_OK;
}
Exemplo n.º 2
0
void Inpin::OnCompletion()
{
    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);
    assert(SUCCEEDED(hr));

    while (!m_buffers.empty())
    {
        IMediaSample* const pSample = m_buffers.front();

        if (pSample == 0)  //EOS notification
            break;         //don't throw EOS notification away

        m_buffers.pop_front();
        pSample->Release();
    }

    typedef channels_t::iterator iter_t;

    iter_t i = m_channels.begin();
    const iter_t j = m_channels.end();

    while (i != j)
    {
        samples_t& ss = *i++;
        ss.clear();
    }

    m_bDone = true;
}
Exemplo n.º 3
0
HRESULT OutpinVideo::GetAvailable(
    LONGLONG* pEarliest,
    LONGLONG* pLatest)
{
    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    if (!bool(m_pPinConnection))
        return VFW_E_NOT_CONNECTED;

    const Inpin& inpin = m_pFilter->m_inpin;
    const GraphUtil::IMediaSeekingPtr pSeek(inpin.m_pPinConnection);

    if (bool(pSeek))
    {
        lock.Release();
        return pSeek->GetAvailable(pEarliest, pLatest);
    }

    return E_FAIL;
}
Exemplo n.º 4
0
HRESULT Inpin::BeginFlush()
{
    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    if (!bool(m_pPinConnection))
        return VFW_E_NOT_CONNECTED;

    //TODO:
    //if (m_bFlush)
    //    return S_FALSE;

#if 0 //def _DEBUG
    odbgstream os;
    os << "vp8decoder::inpin::beginflush" << endl;
#endif

    m_bFlush = true;

    if (IPin* pPin = m_pFilter->m_outpin.m_pPinConnection)
    {
        lock.Release();

        const HRESULT hr = pPin->BeginFlush();
        return hr;
    }

    return S_OK;
}
Exemplo n.º 5
0
HRESULT Inpin::NewSegment(
    REFERENCE_TIME st,
    REFERENCE_TIME sp,
    double r)
{
    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    if (!bool(m_pPinConnection))
        return VFW_E_NOT_CONNECTED;

    if (IPin* pPin = m_pFilter->m_outpin.m_pPinConnection)
    {
        lock.Release();

        const HRESULT hr = pPin->NewSegment(st, sp, r);
        return hr;
    }

    return S_OK;
}
Exemplo n.º 6
0
HRESULT OutpinVideo::GetPositions(
    LONGLONG* pCurrPos,
    LONGLONG* pStopPos)
{
    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    if (!bool(m_pPinConnection))
        return VFW_E_NOT_CONNECTED;

    const Inpin& inpin = m_pFilter->m_inpin;
    const GraphUtil::IMediaSeekingPtr pSeek(inpin.m_pPinConnection);

    if (bool(pSeek))
    {
        lock.Release();
        return pSeek->GetPositions(pCurrPos, pStopPos);
    }

    return E_FAIL;
}
Exemplo n.º 7
0
HRESULT OutpinVideo::GetCurrentPosition(LONGLONG* p)
{
    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    if (!bool(m_pPinConnection))
        return VFW_E_NOT_CONNECTED;

    const Inpin& inpin = m_pFilter->m_inpin;
#if 0
    const GraphUtil::IMediaSeekingPtr pSeek(inpin.m_pPinConnection);

    if (bool(pSeek))
    {
        lock.Release();
        return pSeek->GetCurrentPosition(p);
    }

    if (p == 0)
        return E_POINTER;

    return E_FAIL;
#else
    if (p == 0)
        return E_POINTER;

    *p = inpin.m_start_reftime;

    return S_OK;
#endif
}
Exemplo n.º 8
0
HRESULT Outpin::GetCurrentPosition(LONGLONG* p)
{
    if (p == 0)
        return E_POINTER;

    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    LONGLONG& pos = *p;
    pos = m_pStream->GetCurrTime();

    if (pos < 0)  //means "use duration"
    {
        hr = GetDuration(&pos);

        if (FAILED(hr) || (pos < 0))
            return E_FAIL;
    }

    return S_OK;
}
Exemplo n.º 9
0
HRESULT OutpinVideo::SetTimeFormat(const GUID* p)
{
    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    if (!bool(m_pPinConnection))
        return VFW_E_NOT_CONNECTED;

    const Inpin& inpin = m_pFilter->m_inpin;
    const GraphUtil::IMediaSeekingPtr pSeek(inpin.m_pPinConnection);

    if (bool(pSeek))
    {
        lock.Release();
        return pSeek->SetTimeFormat(p);
    }

    if (p == 0)
        return E_INVALIDARG;

    if (*p == TIME_FORMAT_MEDIA_TIME)
        return S_OK;

    return E_INVALIDARG;
}
Exemplo n.º 10
0
HRESULT OutpinVideo::GetDuration(LONGLONG* p)
{
    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    if (!bool(m_pPinConnection))
        return VFW_E_NOT_CONNECTED;

    const Inpin& inpin = m_pFilter->m_inpin;
    const GraphUtil::IMediaSeekingPtr pSeek(inpin.m_pPinConnection);

    if (bool(pSeek))
    {
        lock.Release();
        return pSeek->GetDuration(p);
    }

    if (p == 0)
        return E_POINTER;

    return E_FAIL;
}
Exemplo n.º 11
0
HRESULT OutpinVideo::QueryPreferredFormat(GUID* p)
{
    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    if (!bool(m_pPinConnection))
        return VFW_E_NOT_CONNECTED;

    const Inpin& inpin = m_pFilter->m_inpin;
    const GraphUtil::IMediaSeekingPtr pSeek(inpin.m_pPinConnection);

    if (bool(pSeek))
    {
        lock.Release();
        return pSeek->QueryPreferredFormat(p);
    }

    if (p == 0)
        return E_POINTER;

    *p = TIME_FORMAT_MEDIA_TIME;
    return S_OK;
}
Exemplo n.º 12
0
HRESULT OutpinVideo::IsFormatSupported(const GUID* p)
{
    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    if (!bool(m_pPinConnection))
        return VFW_E_NOT_CONNECTED;

    const Inpin& inpin = m_pFilter->m_inpin;
    const GraphUtil::IMediaSeekingPtr pSeek(inpin.m_pPinConnection);

    if (bool(pSeek))
    {
        lock.Release();
        return pSeek->IsFormatSupported(p);
    }

    if (p == 0)
        return E_POINTER;

    const GUID& g = *p;

    if (g == TIME_FORMAT_MEDIA_TIME)
        return S_OK;

    return S_FALSE;
}
Exemplo n.º 13
0
HRESULT OutpinVideo::CheckCapabilities(DWORD* pdw)
{
    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    if (!bool(m_pPinConnection))
        return VFW_E_NOT_CONNECTED;

    const Inpin& inpin = m_pFilter->m_inpin;
    const GraphUtil::IMediaSeekingPtr pSeek(inpin.m_pPinConnection);

    if (bool(pSeek))
    {
        lock.Release();
        return pSeek->CheckCapabilities(pdw);
    }

    if (pdw == 0)
        return E_POINTER;

    DWORD& dw = *pdw;

    const DWORD dwRequested = dw;

    if (dwRequested == 0)
        return E_INVALIDARG;

    return E_FAIL;
}
Exemplo n.º 14
0
HRESULT OutpinVideo::GetCapabilities(DWORD* pdw)
{
    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    if (!bool(m_pPinConnection))
        return VFW_E_NOT_CONNECTED;

    const Inpin& inpin = m_pFilter->m_inpin;
    const GraphUtil::IMediaSeekingPtr pSeek(inpin.m_pPinConnection);

    if (bool(pSeek))
    {
        lock.Release();
        return pSeek->GetCapabilities(pdw);
    }

    if (pdw == 0)
        return E_POINTER;

    DWORD& dw = *pdw;
    dw = 0;

    return S_OK;  //?
}
Exemplo n.º 15
0
HRESULT Inpin::EndFlush()
{
    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    if (!bool(m_pPinConnection))
        return VFW_E_NOT_CONNECTED;

#if 0 //def _DEBUG
    odbgstream os;
    os << "vp8decoder::inpin::endflush" << endl;
#endif

    m_bFlush = false;
    m_bEndOfStream = false;

    if (IPin* pPin = m_pFilter->m_outpin.m_pPinConnection)
    {
        lock.Release();

        const HRESULT hr = pPin->EndFlush();
        return hr;
    }

    return S_OK;
}
Exemplo n.º 16
0
HRESULT Outpin::QueryAccept(const AM_MEDIA_TYPE* pmt_query)
{
    if (pmt_query == 0)
        return E_INVALIDARG;

    const AM_MEDIA_TYPE& mt_query = *pmt_query;

    if (mt_query.majortype != MEDIATYPE_Video)
        return S_FALSE;

    if (mt_query.subtype == MEDIASUBTYPE_NV12)
        __noop;
    else if (mt_query.subtype == MEDIASUBTYPE_YV12)
        __noop;
    else if (mt_query.subtype == WebmTypes::MEDIASUBTYPE_I420)
        __noop;
    else if (mt_query.subtype == MEDIASUBTYPE_UYVY)
        __noop;
    else if (mt_query.subtype == MEDIASUBTYPE_YVYU)
        __noop;
    else if (mt_query.subtype == MEDIASUBTYPE_YUY2)
        __noop;
    else if (mt_query.subtype == MEDIASUBTYPE_YUYV)
        __noop;
    else
        return S_FALSE;

    Filter::Lock lock;

    const HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return S_FALSE;

    const Inpin& inpin = m_pFilter->m_inpin;

    if (!bool(inpin.m_pPinConnection))
        return S_FALSE;

    if (mt_query.formattype == FORMAT_None)
        return S_OK;

    if (mt_query.formattype == GUID_NULL)
        return S_OK;

    const AM_MEDIA_TYPE& mt_in = inpin.m_connection_mtv[0];

    if (mt_query.formattype == FORMAT_VideoInfo)
        return QueryAcceptVideoInfo(mt_in, mt_query);

    if (mt_query.formattype == FORMAT_VideoInfo2)
        return QueryAcceptVideoInfo2(mt_in, mt_query);

    return S_FALSE;
}
Exemplo n.º 17
0
HRESULT Pin::EnumMediaTypes(IEnumMediaTypes** pp)
{
    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    //wodbgstream os;
    //os << "mkvsplit::pin[" << m_id << "]::EnumMediaTypes" << endl;

    return m_preferred_mtv.CreateEnum(this, pp);
}
Exemplo n.º 18
0
HRESULT Inpin::QueryInternalConnections(
    IPin** pa,
    ULONG* pn)
{
    if (pn == 0)
        return E_POINTER;

    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    const ULONG m = 1;  //number of output pins

    ULONG& n = *pn;

    if (n == 0)
    {
        if (pa == 0)  //query for required number
        {
            n = m;
            return S_OK;
        }

        return S_FALSE;  //means "insufficient number of array elements"
    }

    if (n < m)
    {
        n = 0;
        return S_FALSE;  //means "insufficient number of array elements"
    }

    if (pa == 0)
    {
        n = 0;
        return E_POINTER;
    }

    IPin*& pin = pa[0];

    pin = &m_pFilter->m_outpin;
    pin->AddRef();

    n = m;
    return S_OK;
}
Exemplo n.º 19
0
HRESULT Inpin::ReceiveCanBlock()
{
    Filter::Lock lock;

    const HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return S_OK;  //?

    if (IMemInputPin* pPin = m_pFilter->m_outpin.m_pInputPin)
    {
        lock.Release();
        return pPin->ReceiveCanBlock();
    }

    return S_FALSE;
}
Exemplo n.º 20
0
HRESULT Inpin::ReceiveConnection(
    IPin* pin,
    const AM_MEDIA_TYPE* pmt)
{
    if (pin == 0)
        return E_INVALIDARG;

    if (pmt == 0)
        return E_INVALIDARG;

    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    if (m_pFilter->m_state != State_Stopped)
        return VFW_E_NOT_STOPPED;

    if (bool(m_pPinConnection))
        return VFW_E_ALREADY_CONNECTED;

    m_connection_mtv.Clear();

    hr = QueryAccept(pmt);

    if (hr != S_OK)
        return VFW_E_TYPE_NOT_ACCEPTED;

    const AM_MEDIA_TYPE& mt = *pmt;

    hr = m_connection_mtv.Add(mt);

    if (FAILED(hr))
        return hr;

    m_pPinConnection = pin;

    //TODO: init decompressor here?

    m_pFilter->m_outpin.OnInpinConnect(mt);

    return S_OK;
}
Exemplo n.º 21
0
HRESULT Outpin::GetPositions(
    LONGLONG* pCurrPos,
    LONGLONG* pStopPos)
{
    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    if (pCurrPos)
        hr = GetCurrentPosition(pCurrPos);

    if (pStopPos)
        hr = GetStopPosition(pStopPos);

    return S_OK;
}
Exemplo n.º 22
0
HRESULT OutpinVideo::ConvertTimeFormat(
    LONGLONG* ptgt,
    const GUID* ptgtfmt,
    LONGLONG src,
    const GUID* psrcfmt)
{
    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    if (!bool(m_pPinConnection))
        return VFW_E_NOT_CONNECTED;

    const Inpin& inpin = m_pFilter->m_inpin;
    const GraphUtil::IMediaSeekingPtr pSeek(inpin.m_pPinConnection);

    if (bool(pSeek))
    {
        lock.Release();
        return pSeek->ConvertTimeFormat(ptgt, ptgtfmt, src, psrcfmt);
    }

    if (ptgt == 0)
        return E_POINTER;

    LONGLONG& tgt = *ptgt;

    const GUID& tgtfmt = ptgtfmt ? *ptgtfmt : TIME_FORMAT_MEDIA_TIME;
    const GUID& srcfmt = psrcfmt ? *psrcfmt : TIME_FORMAT_MEDIA_TIME;

    if (tgtfmt != TIME_FORMAT_MEDIA_TIME)
        return E_INVALIDARG;

    if (srcfmt != TIME_FORMAT_MEDIA_TIME)
        return E_INVALIDARG;

    tgt = src;
    return S_OK;
}
Exemplo n.º 23
0
HRESULT Pin::ConnectionMediaType(AM_MEDIA_TYPE* p)
{
    if (p == 0)
        return E_POINTER;

    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    if (!bool(m_pPinConnection))
        return VFW_E_NOT_CONNECTED;

    const CMediaTypes& mtv = m_connection_mtv;
    assert(mtv.Size() == 1);

    return mtv.Copy(0, *p);
}
Exemplo n.º 24
0
HRESULT Pin::ConnectedTo(IPin** pp)
{
    if (pp == 0)
        return E_POINTER;

    IPin*& p = *pp;

    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    p = m_pPinConnection;

    if (p == 0)
        return VFW_E_NOT_CONNECTED;

    p->AddRef();
    return S_OK;
}
Exemplo n.º 25
0
HRESULT OutpinVideo::SetPositions(
    LONGLONG* pCurr_,
    DWORD dwCurr_,
    LONGLONG* pStop_,
    DWORD dwStop_)
{
    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    if (!bool(m_pPinConnection))
        return VFW_E_NOT_CONNECTED;

    const Inpin& inpin = m_pFilter->m_inpin;
    const GraphUtil::IMediaSeekingPtr pSeek(inpin.m_pPinConnection);

    if (bool(pSeek))
    {
        lock.Release();

        LONGLONG curr;
        LONGLONG* const pCurr = pCurr_ ? pCurr_ : &curr;

        const DWORD dwCurr = pCurr_ ? dwCurr_ : AM_SEEKING_NoPositioning;

        LONGLONG stop;
        LONGLONG* const pStop = pStop_ ? pStop_ : &stop;

        const DWORD dwStop = pStop_ ? dwStop_ : AM_SEEKING_NoPositioning;

        return pSeek->SetPositions(pCurr, dwCurr, pStop, dwStop);
    }

    return E_FAIL;
}
Exemplo n.º 26
0
HRESULT Pin::Disconnect()
{
    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    if (m_pFilter->m_state != State_Stopped)
        return VFW_E_NOT_STOPPED;

    if (!bool(m_pPinConnection))
        return S_FALSE;

    hr = OnDisconnect();
    assert(SUCCEEDED(hr));

    m_pPinConnection = 0;
    m_connection_mtv.Clear();

    return S_OK;
}
Exemplo n.º 27
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HRESULT OutpinVideo::SetRate(double r)
{
    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    if (!bool(m_pPinConnection))
        return VFW_E_NOT_CONNECTED;

    const Inpin& inpin = m_pFilter->m_inpin;
    const GraphUtil::IMediaSeekingPtr pSeek(inpin.m_pPinConnection);

    if (bool(pSeek))
    {
        lock.Release();
        return pSeek->SetRate(r);
    }

    return E_FAIL;
}
Exemplo n.º 28
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HRESULT Pin::QueryPinInfo(PIN_INFO* p)
{
    if (p == 0)
        return E_POINTER;

    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    PIN_INFO& i = *p;

    i.pFilter = static_cast<IBaseFilter*>(m_pFilter);
    i.pFilter->AddRef();

    i.dir = m_dir;

    hr = GetName(i);
    assert(SUCCEEDED(hr));

    return S_OK;
}
Exemplo n.º 29
0
HRESULT Inpin::EndOfStream()
{
    Filter::Lock lock;

    HRESULT hr = lock.Seize(m_pFilter);

    if (FAILED(hr))
        return hr;

    if (!bool(m_pPinConnection))
        return VFW_E_NOT_CONNECTED;

    m_bEndOfStream = true;

    if (IPin* pPin = m_pFilter->m_outpin.m_pPinConnection)
    {
        lock.Release();

#ifdef _DEBUG
        odbgstream os;
        os << "vp8decoder::inpin::EOS: calling pin->EOS" << endl;
#endif

        const HRESULT hr = pPin->EndOfStream();

#ifdef _DEBUG
        os << "vp8decoder::inpin::EOS: called pin->EOS; hr=0x"
           << hex << hr << dec
           << endl;
#endif

        return hr;
    }

    return S_OK;
}
Exemplo n.º 30
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HRESULT Outpin::Connect(IPin* pin, const AM_MEDIA_TYPE* pmt) {
  if (pin == 0)
    return E_POINTER;

  GraphUtil::IMemInputPinPtr pInputPin;

  HRESULT hr = pin->QueryInterface(&pInputPin);

  if (hr != S_OK)
    return hr;

  Filter::Lock lock;

  hr = lock.Seize(m_pFilter);

  if (FAILED(hr))
    return hr;

  if (m_pFilter->GetStateLocked() != State_Stopped)
    return VFW_E_NOT_STOPPED;

  if (bool(m_pPinConnection))
    return VFW_E_ALREADY_CONNECTED;

  if (!bool(m_pFilter->m_inpin.m_pPinConnection))
    return VFW_E_NO_TYPES;  // VFW_E_NOT_CONNECTED?

  m_connection_mtv.Clear();

  if (pmt) {
    hr = QueryAccept(pmt);

    if (hr != S_OK)
      return VFW_E_TYPE_NOT_ACCEPTED;

    if ((pmt->formattype == FORMAT_VideoInfo) ||
        (pmt->formattype == FORMAT_VideoInfo2)) {
      hr = pin->ReceiveConnection(this, pmt);

      if (FAILED(hr))
        return hr;

      m_connection_mtv.Add(*pmt);
    } else  { // partial media type
      const ULONG n = m_preferred_mtv.Size();
      LONG idx = -1;

      for (ULONG i = 0; i < n; ++i) {
        const AM_MEDIA_TYPE& mt = m_preferred_mtv[i];

        if (pmt->subtype == mt.subtype) {
          idx = i;
          break;
        }
      }

      if (idx < 0)  // weird
        return VFW_E_TYPE_NOT_ACCEPTED;

      const AM_MEDIA_TYPE& mt = m_preferred_mtv[idx];

      hr = pin->ReceiveConnection(this, &mt);

      if (FAILED(hr))
        return hr;

      m_connection_mtv.Add(mt);
    }
  } else {
    ULONG i = 0;
    const ULONG j = m_preferred_mtv.Size();

    while (i < j) {
      const AM_MEDIA_TYPE& mt = m_preferred_mtv[i];

      hr = pin->ReceiveConnection(this, &mt);

      if (SUCCEEDED(hr))
        break;

      ++i;
    }

    if (i >= j)
      return VFW_E_NO_ACCEPTABLE_TYPES;

    const AM_MEDIA_TYPE& mt = m_preferred_mtv[i];

    m_connection_mtv.Add(mt);
  }

  GraphUtil::IMemAllocatorPtr pAllocator;

  hr = pInputPin->GetAllocator(&pAllocator);

  if (FAILED(hr)) {
    // hr = CMemAllocator::CreateInstance(&m_sample_factory, &pAllocator);
    hr = CMediaSample::CreateAllocator(&pAllocator);

    if (FAILED(hr))
      return VFW_E_NO_ALLOCATOR;
  }

  assert(bool(pAllocator));

  ALLOCATOR_PROPERTIES props, actual;

  props.cBuffers = -1;  // number of buffers
  props.cbBuffer = -1;  // size of each buffer, excluding prefix
  props.cbAlign = -1;  // applies to prefix, too
  props.cbPrefix = -1;  // imediasample::getbuffer does NOT include prefix

  hr = pInputPin->GetAllocatorRequirements(&props);

  if (props.cBuffers <= 0)
    props.cBuffers = 1;

  LONG w, h;
  GetConnectionDimensions(w, h);

  const long cbBuffer = 2 * w * h;

  if (props.cbBuffer < cbBuffer)
    props.cbBuffer = cbBuffer;

  if (props.cbAlign <= 0)
    props.cbAlign = 1;

  if (props.cbPrefix < 0)
    props.cbPrefix = 0;

  hr = pAllocator->SetProperties(&props, &actual);

  if (FAILED(hr))
    return hr;

  hr = pInputPin->NotifyAllocator(pAllocator, 0);  // allow writes

  if (FAILED(hr) && (hr != E_NOTIMPL))
    return hr;

  m_pPinConnection = pin;
  m_pAllocator = pAllocator;
  m_pInputPin = pInputPin;

  return S_OK;
}