IDvdControl2::PlayBackwards method

The PlayBackwards method plays backward at the specified speed from the current location.

Syntax


HRESULT PlayBackwards(
  [in]  double  dwSpeed,
  [in]  DWORD   dwFlags,
  [out] IDvdCmd **ppCmd
);

dwSpeed [in]: Value that specifies the speed of backward play. This value is a multiplier, where 1.0 is the authored speed. So, a value of 2.5 plays backward at two and one-half times the authored speed, while a value of 0.5 plays backward at half the authored speed. The actual speed of playback depends on the video decoder's capabilities and might differ from the specified rate. For reverse play, audio is muted and no subpicture is displayed. Any speed below 0.00001 is converted to 0.00001.
dwFlags [in]: Bitwise OR of one or more flags from the DVD_CMD_FLAGS enumeration, specifying how to synchronize the command.
ppCmd [out]: Receives a pointer to an IDvdCmd object that can be used to synchronize DVD commands. The caller must release the interface. This parameter can be NULL. For more information, see Synchronizing DVD Commands.

Returns one of the following values.

Return code	Description
S_OK	Success.
VFW_E_DVD_OPERATION_INHIBITED	UOP control prohibits the operation.

This method is demonstrated in the DVDSample application in CDvdCore::Rewind.

The following table shows the Annex J command name to which this method name corresponds, and the domains in which this method is valid.

Annex J Command Name	Valid Domains
Backward_Scan	DVD_DOMAIN_VideoManagerMenu DVD_DOMAIN_VideoTitleSetMenu DVD_DOMAIN_Title

Minimum supported client	Windows XP [desktop apps only]
Minimum supported server	Windows Server 2003 [desktop apps only]
Header	Strmif.h (include Dshow.h)
Library	Strmiids.lib