EVT_ACX_STREAMAUDIOENGINE_ASSIGN_LAST_BUFFER_POSITION callback function (acxelements.h)
The EVT_ACX_STREAMAUDIOENGINE_ASSIGN_LAST_BUFFER_POSITION callback function is implemented by the driver and is called when the position of the last valid byte in the audio buffer is set for the specified stream audio engine.
Syntax
EVT_ACX_STREAMAUDIOENGINE_ASSIGN_LAST_BUFFER_POSITION EvtAcxStreamaudioengineAssignLastBufferPosition;
NTSTATUS EvtAcxStreamaudioengineAssignLastBufferPosition(
ACXSTREAMAUDIOENGINE StreamAudioEngine,
ULONG Position
)
{...}
Parameters
StreamAudioEngine
An existing, initialized, ACXSTREAMAUDIOENGINE object. For more information about ACX objects, see Summary of ACX Objects.
Position
Indicates the position of the last valid byte in the audio buffer of the specified stream audio engine. For more information on the position value, see KSPROPERTY_AUDIO_WAVERT_CURRENT_WRITE_LASTBUFFER_POSITION.
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.
EVT_ACX_STREAMAUDIOENGINE_ASSIGN_LAST_BUFFER_POSITION CodecR_EvtAcxStreamAudioEngineAssignLastBufferPosition;
NTSTATUS
CodecR_EvtAcxStreamAudioEngineAssignLastBufferPosition(
_In_ ACXSTREAMAUDIOENGINE StreamAudioEngine,
_In_ ULONG Position
)
{
NTSTATUS status = STATUS_INVALID_PARAMETER;
ACXSTREAM stream;
PCODEC_STREAM_CONTEXT ctx;
CRenderStreamEngine * streamEngine = NULL;
PAGED_CODE();
stream = AcxStreamAudioEngineGetStream(StreamAudioEngine);
if (stream)
{
ctx = GetCodecStreamContext(stream);
streamEngine = static_cast<CRenderStreamEngine*>(ctx->StreamEngine);
status = streamEngine->SetLastBufferPosition(Position);
}
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 |