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/**************************************************************************
AVStream Filter-Centric Sample
Copyright (c) 1999 - 2001, Microsoft Corporation
File:
audio.h
Abstract:
This file contains the audio capture pin header.
History:
created 6/28/01
**************************************************************************/
class CAudioCapturePin :
public CCapturePin
{
private:
//
// The wave object used to synthesize audio data.
//
CWaveObject *m_WaveObject;
public:
//
// CAudioCapturePin():
//
// Construct a new audio capture pin.
//
CAudioCapturePin (
IN PKSPIN Pin
) : CCapturePin (Pin)
{
}
//
// ~CAudioCapturePin():
//
// Destruct an audio capture pin.
//
~CAudioCapturePin (
)
{
}
//
// Acquire():
//
// Called when the audio capture pin is transitioning into the acquire
// state (from either stop or pause). This routine will get ahold of
// the wave object from the filter.
//
virtual
NTSTATUS
Acquire (
IN KSSTATE FromState
);
//
// CaptureFrame():
//
// This is called when the filter processes and wants to trigger processing
// of an audio frame. The routine will compute how far into the stream
// we've progressed and ask the filter's wave object to copy enough
// "synthesized" audio data from the wave object in order to reach
// the position.
//
virtual
NTSTATUS
CaptureFrame (
IN PKSPROCESSPIN ProcessPin,
IN ULONG Tick
);
/*************************************************
Dispatch Functions
*************************************************/
//
// DispatchCreate():
//
// This is the creation dispatch for the audio capture pin on the filter.
// It creates the CAudioCapturePin, associates it with the AVStream pin
// object and bags the class object for automatic cleanup when the
// pin is closed.
//
static
NTSTATUS
DispatchCreate (
IN PKSPIN Pin,
IN PIRP Irp
);
//
// DispatchSetFormat():
//
// This is the set data format dispatch for the pin. This will be called
// BEFORE pin creation to validate that a data format selected is a match
// for the range pulled out of our range list. It will also be called
// for format changes.
//
// If OldFormat is NULL, this is an indication that it's the initial
// call and not a format change. Even fixed format pins get this call
// once.
//
static
NTSTATUS
DispatchSetFormat (
IN PKSPIN Pin,
IN PKSDATAFORMAT OldFormat OPTIONAL,
IN PKSMULTIPLE_ITEM OldAttributeList OPTIONAL,
IN const KSDATARANGE *DataRange,
IN const KSATTRIBUTE_LIST *AttributeRange OPTIONAL
);
//
// IntersectHandler():
//
// This is the data intersection handler for the capture pin. This
// determines an optimal format in the intersection of two ranges,
// one local and one possibly foreign. If there is no compatible format,
// STATUS_NO_MATCH is returned.
//
static
NTSTATUS
IntersectHandler (
IN PKSFILTER Filter,
IN PIRP Irp,
IN PKSP_PIN PinInstance,
IN PKSDATARANGE CallerDataRange,
IN PKSDATARANGE DescriptorDataRange,
IN ULONG BufferSize,
OUT PVOID Data OPTIONAL,
OUT PULONG DataSize
);
};
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