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Getting Buffers

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[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

If your filter has a custom allocator that uses filter resources, the allocator's IMemAllocator::GetBuffer method should hold the streaming lock, as with other streaming methods:

HRESULT CMyInputAllocator::GetBuffer(
    IMediaSample **ppBuffer,
    REFERENCE_TIME *pStartTime, 
    REFERENCE_TIME *pEndTime,
    DWORD dwFlags)
{
    CAutoLock cObjectLock(&m_csReceive);

    /* Use resources. */

    return CMemAllocator::GetBuffer(ppBuffer, pStartTime, pEndTime, dwFlags);    
}

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