IMFMediaType::IsCompressedFormat method

Queries whether the media type is a temporally compressed format. Temporal compression uses information from previously decoded samples when decompressing the current sample.

Syntax

HRESULT IsCompressedFormat(
  [out] BOOL *pfCompressed
);

Parameters

pfCompressed [out]

Receives a Boolean value. The value is TRUE if the format uses temporal compression, or FALSE if the format does not use temporal compression.

Return value

If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Remarks

This method returns FALSE in pfCompressed if the media type's MF_MT_ALL_SAMPLES_INDEPENDENT attribute is TRUE. If the MF_MT_ALL_SAMPLES_INDEPENDENT attribute is FALSE or not set, the method returns TRUE.

If the method returns TRUE in pfCompressed, it is a hint that the format has temporal compression applied to it. If the method returns FALSE, the format does not use temporal compression, although it might use intra-frame compression.

This interface is available on the following platforms if the Windows Media Format 11 SDK redistributable components are installed:

• Windows XP with Service Pack 2 (SP2) and later.
• Windows XP Media Center Edition 2005 with KB900325 (Windows XP Media Center Edition 2005) and KB925766 (October 2006 Update Rollup for Windows XP Media Center Edition) installed.

Requirements

See also

IMFMediaType

Media Types