MoInitMediaType function (dmort.h)

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The MoInitMediaType function initializes a media type structure.

Syntax

HRESULT MoInitMediaType(
  DMO_MEDIA_TYPE *pmt,
  DWORD          cbFormat
);

Parameters

pmt

Pointer to an uninitialized DMO_MEDIA_TYPE structure allocated by the caller.

cbFormat

Number of bytes to allocate for the format block. Can be zero.

Return value

Returns an HRESULT value. Possible values include the following.

Remarks

This function allocates the format block for a DMO_MEDIA_TYPE structure. The format block is allocated on the heap. The allocated memory is not initialized. The caller must free the format block by calling the MoFreeMediaType function.

This function also sets the cbFormat and pbFormat members of the DMO_MEDIA_TYPE structure.

Requirements