AVObjects Library: Samples

Revision as of 15:24, 30 June 2014

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TODO: Samples

HRESULT CMuxedPCM::ReadFrame(ULONGLONG ullFrame, BYTE* pbFrame, DWORD cbFrame, DWORD* pcbActual, LONG* plTempOffset/* = NULL*/, bool bReverse/* = false*/,DWORD nSkip /*= 0*/, bool bDirectRead/* = false*/) { ATLASSERT(pbFrame != NULL); if(pbFrame == NULL) return E_INVALIDARG; ATLASSERT(pcbActual != NULL); if(pcbActual == NULL) return E_INVALIDARG;

DWORD cbFrameSize = GetFrameSize(); ATLASSERT(cbFrame >= cbFrameSize); if(cbFrame < cbFrameSize) return E_INVALIDARG;

DWORD dwSourceCount = m_source.GetSize(); ATLASSERT(dwSourceCount > 0);

if (dwSourceCount == 1) return m_source[0]->ReadFrame(ullFrame, pbFrame, cbFrame, pcbActual, plTempOffset, bReverse, nSkip, bDirectRead);

CMType mt; HRESULT hr = FillMT(mt); if (hr != S_OK) return hr;

ATLASSERT(mt.IsAudio()); const WAVEFORMATEX* pwf = mt;

DWORD cbBuf = cbFrame / dwSourceCount; CMAlloc mem; if (!mem.Alloc(cbBuf)) return hr;

BYTE* pbBuf = mem.Memory(); ATLASSERT(pbBuf);

DWORD nBlockAlign = pwf->nBlockAlign / dwSourceCount; *pcbActual = 0;

// ATLTRACE2(atlTraceGeneral, 2, _T("%s::ReadFrame(): ") // _T("MuxedReadStart: ullFrame = %I64u(0x%I64x), cbFrame = %d(0x%x)\n"), GetClassName(), ullFrame, ullFrame, // cbFrame, cbFrame);

memset(pbFrame, 0, cbFrame); for(DWORD n = 0; n < dwSourceCount; n++) { DWORD cbActual = 0; hr = m_source[n]->ReadFrame(ullFrame, pbBuf, cbBuf, &cbActual, NULL, bReverse, nSkip, bDirectRead); if (hr != S_OK) return hr;

if (cbActual > *pcbActual) *pcbActual = cbActual;

BYTE* pbIn = pbBuf; BYTE* pbOut = pbFrame + nBlockAlign * n; BYTE* pbEnd = pbBuf + cbActual; for(; pbIn < pbEnd; pbIn += nBlockAlign, pbOut += pwf->nBlockAlign) { //DWORD cbLen = (pbIn + nBlockAlign >= pbEnd)? pbEnd - pbIn : nBlockAlign; memcpy(pbOut, pbIn, nBlockAlign); } }

*pcbActual *= dwSourceCount; // ATLTRACE2(atlTraceGeneral, 2, _T("%s::ReadFrame(): ") // _T("MuxedReadAStop Actual: %d(0x%x)\n"), GetClassName(), *pcbActual, *pcbActual); // Debug_Dump(atlTraceGeneral, 2, *pcbActual, pbFrame);

return S_OK; };