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Windows Driver Kit DDI reference (nf-acxelements-acxstreamaudioenginegetstream)

Description

The AcxStreamAudioEngineGetStream function retrieves the ACXSTREAM object associated with the given stream audio engine object. For more information about ACX objects, see Summary of ACX Objects.

Parameters

`StreamAudioEngine`

An existing, initialized, ACXSTREAMAUDIOENGINE object. For more information about ACX objects, see Summary of ACX Objects.

Return value

Returns STATUS_SUCCESS if the call was successful. Otherwise, it returns an appropriate error code. For more information, see Using NTSTATUS Values.

Remarks

Example

Example usage is shown below.

NTSTATUS
DspR_EvtAcxStreamAudioEngineRetrievePresentationPosition(
    _In_    ACXSTREAMAUDIOENGINE    StreamAudioEngine,
    _Out_   PULONGLONG              PositionInBlocks,
    _Out_   PULONGLONG              QPCPosition
)
{
    NTSTATUS status = STATUS_INVALID_PARAMETER;
    ACXSTREAM stream;
    PDSP_STREAM_CONTEXT ctx;
    COffloadStreamEngine* streamEngine = NULL;

    PAGED_CODE();

    stream = AcxStreamAudioEngineGetStream(StreamAudioEngine);
    if (stream)
    {
        ctx = GetDspStreamContext(stream);

        streamEngine = static_cast<COffloadStreamEngine*>(ctx->StreamEngine);

        status = streamEngine->GetPresentationPosition(PositionInBlocks, QPCPosition);
    }

    return status;
}

ACX requirements

Minimum ACX version: 1.0

For more information about ACX versions, see ACX version overview.

AcxStreamAudioEngineGetStream - NtDoc