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AcxStreamAudioEngineGetStream function (acxelements.h)

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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.

Syntax

ACXSTREAM AcxStreamAudioEngineGetStream(
  ACXSTREAMAUDIOENGINE StreamAudioEngine
);

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.

Requirements

Requirement Value
Header acxelements.h
IRQL PASSIVE_LEVEL

See also