IAMCutListElement Interface

The IAMCutListElement interface describes a base object, which represents an element in a cutlist. For a simpler interface that provides basic cutlist functionality, applications can use IFileClip to create an object that supports this interface.

See About Cutlists and Using Cutlists for more information.

When to Implement

Usually, you don't need to implement this interface because DirectShow provides the CLSID_VideoFileClip and CLSID_AudioFileClip objects, which can create an object that implements it for you. However, you can implement this interface in your application when you need to change this interface's default behavior.

When to Use

Use this interface in your filter when you need to get specific elements of a cutlist.

When compiling a cutlist application you must explicitly include the cutlist header file as follows:

#include <cutlist.h>

Methods in Vtable Order

IUnknown methods	Description
QueryInterface	Retrieves pointers to supported interfaces.
AddRef	Increments the reference count.
Release	Decrements the reference count.

IAMCutListElement methods	Description
GetElementStartPosition	Retrieves the media time of the element's start in the time scale of the cutlist.
GetElementDuration	Retrieves the duration of the cutlist element.
IsFirstElement	Determines if the element is the first in the cutlist.
IsLastElement	Determines if the element is the last in the cutlist.
IsNull	Determines if the element is null.
ElementStatus	Determines the status of the element.

---

IAMCutListElement::ElementStatus

IAMCutListElement Interface

Determines the status of the element.

HRESULT ElementStatus(
  DWORD *pdwStatus,
  DWORD dwTimeoutMs
  );

Parameters

pdwStatus

[in/out] Status. On input, if this parameter contains CL_WAIT_FOR_STATE and an additional state value from the CL_ELEM_STATUS enumerated data type, this method waits dwTimeoutMs milliseconds until the element is in that state before returning. On output, this is a logical combination of flags from the CL_ELEM_STATUS enumerated data type.

dwTimeoutMs

[in] Timeout value, in milliseconds.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. HRESULT can include one of the following standard constants, or other values not listed.

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Argument is invalid.
E_NOTIMPL	Method is not supported.
S_OK	Success. The element is null.

---

IAMCutListElement::GetElementDuration

IAMCutListElement Interface

Retrieves the duration of the cutlist element.

HRESULT GetElementDuration(
  REFERENCE_TIME *pmtDuration
  );

Parameters

pmtDuration

[out] Duration of the element in REFERENCE_TIME.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. HRESULT can include one of the following standard constants, or other values not listed.

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Argument is invalid.
E_NOTIMPL	Method is not supported.
E_POINTER	Null pointer argument.
S_OK	Success.

Remarks

When you call the IFileClip::CreateCut method to create the element, the difference between its mtTrimOut and mtTrimIn parameters determines the duration.

---

IAMCutListElement::GetElementStartPosition

IAMCutListElement Interface

Retrieves the media time of the element's start in the time scale of the cutlist.

HRESULT GetElementStartPosition(
  REFERENCE_TIME *pmtStart
  );

Parameters

pmtStart

[out] Pointer to the media time for the start of the element.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. HRESULT can include one of the following standard constants, or other values not listed.

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Argument is invalid.
E_NOTIMPL	Method is not supported.
E_POINTER	Null pointer argument.
S_OK	Success.

Remarks

Times retrieved by this method are relative to the time within the cutlist. For example, the first element in the cutlist starts at time zero.

---

IAMCutListElement::IsFirstElement

IAMCutListElement Interface

Determines if the element is the first in the cutlist.

HRESULT IsFirstElement(void);

Return Values

Returns an HRESULT value that depends on the implementation of the interface. HRESULT can include one of the following standard constants, or other values not listed.

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Argument is invalid.
E_NOTIMPL	Method is not supported.
S_OK	Success. This is the first element in the cutlist.

---

IAMCutListElement::IsLastElement

IAMCutListElement Interface

Determines if the element is the last in the cutlist.

HRESULT IsLastElement(void);

Return Values

Returns an HRESULT value that depends on the implementation of the interface. HRESULT can include one of the following standard constants, or other values not listed.

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Argument is invalid.
E_NOTIMPL	Method is not supported.
S_OK	Success. This is the last element in the cutlist.

---

IAMCutListElement::IsNull

IAMCutListElement Interface

Determines if the element is null.

HRESULT IsNull(void);

Return Values

Returns an HRESULT value that depends on the implementation of the interface. HRESULT can include one of the following standard constants, or other values not listed.

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Argument is invalid.
E_NOTIMPL	Method is not supported.
S_FALSE	Element is not null.
S_OK	Success. The element is null.

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