Compartilhar via

IDvdControl2::PlayForwards

  • Artigo
 
Microsoft DirectShow 9.0

IDvdControl2::PlayForwards

The PlayForwards method plays forward at the specified speed from the current location.

Syntax

  HRESULT PlayForwards(
  double dwSpeed,
  DWORD dwFlags,
  IDvdCmd **ppCmd
);

Parameters

dwSpeed

[in] Value that specifies the playback speed. This value is a multiplier, where 1.0 is the authored speed, so a value of 2.5 plays at two and one-half times the authored speed, while a value of 0.5 plays at half the authored speed. The actual speed of playback depends on the capabilities of the video decoder. Values below 0.00001 are 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.

Return Values

Returns one of the following values.

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

Remarks

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

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
Forward_Scan DVD_DOMAIN_VideoManagerMenu
DVD_DOMAIN_VideoTitleSetMenu
DVD_DOMAIN_Title

Requirements

Header: Declared in Strmif.h; include Dshow.h.

Library: Use Strmiids.lib.

See Also