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CBasePin::TryMediaTypes

  • Статья
 
Microsoft DirectShow 9.0

CBasePin::TryMediaTypes

Given a list of media types, the TryMediaTypes method tries to complete a connection using one of those types.

Syntax

  virtual HRESULT TryMediaTypes(
    IPin *pReceivePin,
    const CMediaType *pmt,
    IEnumMediaTypes *pEnum
);

Parameters

pReceivePin

Pointer to the receiving pin's IPin interface.

pmt

Pointer to a CMediaType object that limits the possible media types, or NULL.

pEnum

Pointer to an IEnumMediaTypes interface, used to enumerate the list of media types.

Return Value

Returns an HRESULT value. Possible values include those in the following table.

Value Description
S_OK Success.
VFW_E_NO_ACCEPTABLE_TYPES Did not find an acceptable media type.

Remarks

For each media type returned by the IEnumMediaTypes interface, this method attempts a connection by calling the CBasePin::AttemptConnection method.

If the pmt parameter is non-NULL, the pin skips media types that do not match this type. The pmt parameter can specify a partial media type. A partial media type has a value of GUID_NULL for either the major type, the subtype, or the format. The GUID_NULL value matches any type, similar to a "wildcard" value.

Requirements

**  Header:** Declared in Amfilter.h; include Streams.h.

**  Library:** Use Strmbase.lib (retail builds) or Strmbasd.lib (debug builds).

See Also