IDvdControl Interface

The IDvdControl interface controls the playback and search mechanisms of a DVD title that contains one or more video movies.

The DVD file system is very different from a format such as CD-ROM, which contains a linear series of tracks not easily customizable by the author. The author of DVD-formatted media files can control track layout and navigation much more precisely; the media file itself has many parts and control mechanisms, which enables the author to arrange and rearrange the playback order as needed. You can locate a specific portion of a file by time (in hours, minutes, seconds, and frames) or by chapter value.

A media file is made up of a list of program chains (PGCs), each of which is made up of a list of programs, each of which is made up of a list of cells, each of which is made up of a list of video object units (VOBUs), each of which is made up of a list of packs, and each of which is made up of actual MPEG data.

To obtain a copy of the DVD-Video specification, "DVD Specifications for Read-Only Disc, Part 3, Video Specifications," contact Toshiba Corporation at 1-1, Shibaura 1-Chrome, Minato-ku, Tokyo 105-01, Japan, Tel. +81-3-5444-9580, Fax. +81-3-5444-9430.

When to Implement

This interface is implemented by the Microsoft® DirectShow™ DVD Navigator to enable DVD playback.

When to Use

Use this interface to control playback (set root drive, play, stop, and so forth) or use DVD-specific functionality such as menus and buttons when playing DVD-Video files.

Methods in Vtable Order

IUnknown methods	Description
QueryInterface	Retrieves pointers to supported interfaces.
AddRef	Increments the reference count.
Release	Decrements the reference count.

IDvdControl methods	Description
TitlePlay	Finds the media file with the specified title index and plays it back.
ChapterPlay	Plays the media file with the specified title index and chapter value.
TimePlay	Plays the media file with the specified title index, starting at the specified time.
StopForResume	Transitions playback to the DVD_DOMAIN_Stop state after saving resume information.
GoUp	Halts playback of the current media file and starts playback of the designated previous program chain (PGC).
TimeSearch	Halts playback of the current chapter and starts playback from the specified time in the same media file.
ChapterSearch	Halts playback of the current chapter and starts playback from the specified chapter value in the same media file.
PrevPGSearch	Halts playback of the current chapter and starts playback from the previous chapter within the title.
TopPGSearch	Halts playback of the current chapter and restarts playback of the current chapter within the title.
NextPGSearch	Halts playback of the current chapter and starts playback from the next chapter within the title.
ForwardScan	Search forward through the current disc at the specified speed.
BackwardScan	Search backward through the current disc at the specified speed.
MenuCall	Displays the specified menu on the screen.
Resume	Returns to playing back a title from a menu.
UpperButtonSelect	Selects the upper directional button from the displayed menu.
LowerButtonSelect	Selects the lower directional button from the displayed menu.
LeftButtonSelect	Selects the left directional button from the displayed menu.
RightButtonSelect	Selects the right directional button from the displayed menu.
ButtonActivate	Activates the selected button.
ButtonSelectAndActivate	Selects and activates the specified button.
StillOff	Resumes playback, cancelling still mode.
PauseOn	Pauses the current media file playback.
PauseOff	Unpauses the current media file playback.
MenuLanguageSelect	Sets the displayed language for navigation menus.
AudioStreamChange	Sets the current audio stream.
SubpictureStreamChange	Enables or disables picture-in-picture mode and sets the subpicture to the specified source.
AngleChange	Sets the new display angle.
ParentalLevelSelect	Sets the parental access level for the current media file.
ParentalCountrySelect	Sets the current country for controlling parental access levels.
KaraokeAudioPresentationModeChange	Sets the audio playback mode to karaoke.
VideoModePreferrence	Sets the video display mode the user prefers.
SetRoot	Sets the root directory containing the DVD-Video volume.
MouseActivate	Selects and activates a DVD button in response to a mouse click.
MouseSelect	Selects a DVD button in response to mouse movement.
ChapterPlayAutoStop	Start playing at the specified chapter within the specified title and play the number of chapters specified.

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IDvdControl::AngleChange

IDvdControl Interface

Sets the new display angle.

HRESULT AngleChange(
  ULONG ulAngle
  );

Parameters

ulAngle

[in] Value of the new angle, which must be between 1 and 9.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Input argument is invalid.
E_NOTIMPL	Method is not supported.
E_OUTOFMEMORY	Out of memory (insufficient buffer space).
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

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IDvdControl::AudioStreamChange

IDvdControl Interface

Sets the current audio stream.

HRESULT AudioStreamChange(
  ULONG nAudio
  );

Parameters

nAudio

[in] Value that specifies the audio track to use, which must be between 0 and 7.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Input argument is invalid.
E_NOTIMPL	Method is not supported.
E_OUTOFMEMORY	Out of memory (insufficient buffer space).
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

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IDvdControl::BackwardScan

IDvdControl Interface

Search backward through the current disc at the specified speed.

HRESULT BackwardScan(
  double dwSpeed
  );

Parameters

dwSpeed

[in] Value that specifies how quickly DirectShow will search through the media file. This value is a multiplier, where 1.0 is the authored speed, so a value of 2.5 would search backward at two and one-half times the authored speed.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Input argument is invalid.
E_NOTIMPL	Method is not supported.
E_OUTOFMEMORY	Out of memory (insufficient buffer space).
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

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IDvdControl::ButtonActivate

IDvdControl Interface

Activates the selected button.

HRESULT ButtonActivate(void);

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_NOTIMPL	Method is not supported.
E_OUTOFMEMORY	Out of memory (insufficient buffer space).
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

Remarks

"Selecting" a DVD button simply highlights the button but does not "activate" the button. Selecting is the Windows equivalent of tabbing to a button but not pressing the space bar or enter key. Activating is the Windows equivalent of pressing the space bar or enter key after tabbing to a button.

See Also

IDvdControl::ButtonSelectAndActivate

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IDvdControl::ButtonSelectAndActivate

IDvdControl Interface

Selects and activates the specified button.

HRESULT ButtonSelectAndActivate(
  ULONG uiButton
  );

Parameters

uiButton

[in] Value that specifies the button that will be selected and activated, which must be between 1 and 36.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Input argument is invalid.
E_NOTIMPL	Method is not supported.
E_OUTOFMEMORY	Out of memory (insufficient buffer space).
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

Remarks

Electronic remote control devices typically have a number of buttons that activate various functions of a DVD playback unit. Typically, you call this method when a user clicks a button on the control device; DirectShow then indicates that the button was selected (by playing a sound or changing a graphic, for example) and calls methods appropriate to which button was selected, such as ButtonActivate.

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IDvdControl::ChapterPlay

IDvdControl Interface

Plays the media file with the specified title index and chapter value.

HRESULT ChapterPlay(
  ULONG uiTitle,
  ULONG uiChapter
  );

Parameters

uiTitle

[in] Value that specifies the title number DirectShow will play back; this value must be between 1 and 99.

uiChapter

[in] Value that specifies the chapter within the specified title where DirectShow will start playback; this value must be between 1 and 999.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Input argument is invalid.
E_NOTIMPL	Method is not supported.
E_OUTOFMEMORY	Out of memory (insufficient buffer space).
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

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IDvdControl::ChapterPlayAutoStop

IDvdControl Interface

Instructs the DVD player to start playing at the specified chapter within the specified title and play the number of chapters specified.

HRESULT ChapterPlayAutoStop(
  ULONG ulTitle,
  ULONG ulChapter,
  ULONG ulChaptersToPlay
  );

Parameters

ulTitle

[in] Title number for playback.

ulChapter

[in] Chapter number to start playback.

ulChaptersToPlay

[in] Number of chapters to play from the start chapter.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Input argument is invalid.
E_NOTIMPL	Method is not supported.
E_OUTOFMEMORY	Out of memory (insufficient buffer space).
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

Remarks

Chapters range from 1 to 999. See EC_DVD_CHAPTER_AUTOSTOP for more information.

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IDvdControl::ChapterSearch

IDvdControl Interface

Halts playback of the current chapter and starts playback from the specified chapter within the same title.

HRESULT ChapterSearch(
  ULONG Chapter
  );

Parameters

Chapter

Chapter value that specifies the point where playback will begin.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Input argument is invalid.
E_NOTIMPL	Method is not supported.
E_OUTOFMEMORY	Out of memory (insufficient buffer space).
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

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IDvdControl::ForwardScan

IDvdControl Interface

Search forward through the current disc at the specified speed.

HRESULT ForwardScan(
  double dwSpeed
  );

Parameters

dwSpeed

[in] Value that specifies how quickly DirectShow will search through the media file. This value is a multiplier, where 1.0 is the authored speed, so a value of 2.5 would search forward at two and one-half times the authored speed.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Input argument is invalid.
E_NOTIMPL	Method is not supported.
E_OUTOFMEMORY	Out of memory (insufficient buffer space).
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

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IDvdControl::GoUp

IDvdControl Interface

Halts playback of the current media file and starts playback of the designated previous program chain (PGC).

HRESULT GoUp(void);

Return Values

Returns an HRESULT value.

Remarks

Each PGC is associated with a previous PGC at authoring time, which this method sets as the new playback file.

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IDvdControl::KaraokeAudioPresentationModeChange

IDvdControl Interface

Sets the audio playback mode to karaoke.

HRESULT KaraokeAudioPresentationModeChange(
  ULONG ulMode
  );

Parameters

ulMode

[in] Requested audio playback mode.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Input argument is invalid.
E_NOTIMPL	Method is not supported.
E_OUTOFMEMORY	Out of memory (insufficient buffer space).
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

Remarks

Karaoke support is currently not implemented.

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IDvdControl::LeftButtonSelect

IDvdControl Interface

Selects the left directional button from the displayed menu.

HRESULT LeftButtonSelect(void);

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_NOTIMPL	Method is not supported.
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

Remarks

On physical or electronic remote control devices, there is often a group of four directional buttons used for certain types of operations (such as menu navigation). This method tells DirectShow that something (the user, probably) triggered the left directional button.

"Selecting" a DVD button simply highlights the button but does not "activate" the button. Selecting is the Windows equivalent of tabbing to a button but not pressing the space bar or enter key. Activating is the Windows equivalent of pressing the space bar or enter key after tabbing to a button.

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IDvdControl::LowerButtonSelect

IDvdControl Interface

Selects the lower directional button from the displayed menu.

HRESULT LowerButtonSelect(void);

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_NOTIMPL	Method is not supported.
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

Remarks

On physical or electronic remote control devices, there is often a group of four directional buttons used for certain types of operations (such as menu navigation). This method tells DirectShow that something (the user, probably) triggered the lower directional button.

"Selecting" a DVD button simply highlights the button but does not "activate" the button. Selecting is the Windows equivalent of tabbing to a button but not pressing the space bar or enter key. Activating is the Windows equivalent of pressing the space bar or enter key after tabbing to a button.

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IDvdControl::MenuCall

IDvdControl Interface

Displays the specified menu on the screen.

HRESULT MenuCall(
  DVD_MENU_ID MenuID
  );

Parameters

MenuID

[in] Value that specifies the menu to display. Member of the DVD_MENU_ID enumerated data type.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Input argument is invalid.
E_NOTIMPL	Method is not supported.
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

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IDvdControl::MenuLanguageSelect

IDvdControl Interface

Sets the displayed language for navigation menus.

HRESULT MenuLanguageSelect(
  LCID LanguageCode
  );

Parameters

LanguageCode

Value that specifies the new language.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Input argument is invalid.
E_NOTIMPL	Method is not supported.
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

Remarks

This method selects the default language for menus. Call this method only from the DVD stop state (DVD_DOMAIN_Stop). Applications specify languages with Windows standard LCIDs. LCIDs can be created from ISO-639 codes with:

MAKELCID( MAKELANGID(wISO639LangID ,SUBLANG_DEFAULT ), SORT_DEFAULT )

You might have to use 'jp' instead of 'ja' for the ISO639 code for Japanese if authored content uses 'jp' instead of 'ja' for Japanese or if MAKELANGID uses the wrong code for Japanese.

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IDvdControl::MouseActivate

IDvdControl Interface

Selects and activates a DVD button in response to a mouse click.

HRESULT MouseActivate(
  POINT point );

Parameters

point

[in] Specified point within the display window.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Input argument is invalid.
E_NOTIMPL	Method is not supported.
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

Remarks

This method checks the specified point within the display window to see if it is within a current DVD button's highlight rectangle. If it is, this method selects and then activates the button.

DVD buttons do not all necessarily have highlight rectangles. Button rectangles can overlap, and the rectangles do not always correspond to the visual representation of DVD buttons.

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IDvdControl::MouseSelect

IDvdControl Interface

Selects a DVD button in response to mouse movement.

HRESULT MouseSelect(
  POINT point );

Parameters

point

[in] Specified point within the display window.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Input argument is invalid.
E_NOTIMPL	Method is not supported.
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

Remarks

This method checks the specified point within the display window to see if it is within a current DVD button's highlight rectangle. If it is, this method selects the button.

DVD buttons do not all necessarily have highlight rectangles. Button rectangles can overlap, and the rectangles do not always correspond to the visual representation of DVD buttons.

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IDvdControl::NextPGSearch

IDvdControl Interface

Halts playback of the current chapter and starts playback from the next chapter within the title.

HRESULT NextPGSearch(void);

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_NOTIMPL	Method is not supported.
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

---

IDvdControl::ParentalCountrySelect

IDvdControl Interface

Sets the current country for controlling parental access levels.

HRESULT ParentalCountrySelect(
  WORD wCountry
  );

Parameters

wCountry

[in] Value that specifies the current country according to the Alpha-2 Code defined in ISO3166 (except the code 'zz').

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Input argument is invalid.
E_NOTIMPL	Method is not supported.
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

See Also

ParentalLevelSelect

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IDvdControl::ParentalLevelSelect

IDvdControl Interface

Sets the parental access level for the current media file.

HRESULT ParentalLevelSelect(
  ULONG ulParentalLevel
  );

Parameters

ulParentalLevel

Value that specifies the current media file parental access level. Should be a value from 1 to 8, inclusive. Predefined parental levels are as follows.

1	The rating is G, General.
3	The rating is PG, Parental Guidance Suggested.
4	The rating is PG13, Parental Guidance Suggested, not recommended for those under 13.
6	The rating is R, Restricted.
7	The rating is NC17.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Input argument is invalid.
E_NOTIMPL	Method is not supported.
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

Remarks

This method sets the current user's access level; this access level determines what media files the user can play back. Higher levels can play lower level content; lower levels can't play higher-level content. For example, adults can watch child-safe content, but children can't watch adult content.

The DVD Navigator filter provides no restriction on setting the parental level. DVD player applications can enforce restrictions on the parental level setting, such as providing password protection for raising the current parental level. Parental management in the DVD Navigator is disabled by default.

To disable parental management, pass 0xffffffff for ulParentalLevel. If parental management is disabled, then the player will play the first program chain (PGC) in a parental block regardless of parental IDs.

See Also

ParentalCountrySelect

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IDvdControl::PauseOff

IDvdControl Interface

Unpauses the current media file playback, which returns it to normal playback.

HRESULT PauseOff(void);

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_NOTIMPL	Method is not supported.
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

Remarks

If the media file wasn't paused in playback, this method does nothing.

See Also

IDvdControl::PauseOn

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IDvdControl::PauseOn

IDvdControl Interface

Pauses the current media file playback.

HRESULT PauseOn( );

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_NOTIMPL	Method is not supported.
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

Remarks

This method freezes playback and any internal timers, similar to IMediaControl::Pause.

If the media file wasn't running, this method does nothing.

See Also

IDvdControl::PauseOff

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IDvdControl::PrevPGSearch

IDvdControl Interface

Halts playback of the current chapter and starts playback from the previous chapter within the title.

HRESULT PrevPGSearch(void);

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_NOTIMPL	Method is not supported.
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

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IDvdControl::Resume

IDvdControl Interface

Returns to playing back a title from a menu.

HRESULT Resume( );

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_NOTIMPL	Method is not supported.
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

Remarks

If the file is stopped or already running, this method does nothing.

This method returns to title playback in DVD_DOMAIN_Title. Applications typically call this method after MenuCall which puts the DVD Navigator in DVD_DOMAIN_VideoTitleSetMenu or DVD_DOMAIN_VideoManagerMenu.

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IDvdControl::RightButtonSelect

IDvdControl Interface

Selects the right directional button from the displayed menu.

HRESULT RightButtonSelect( );

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_NOTIMPL	Method is not supported.
E_OUTOFMEMORY	Out of memory (insufficient buffer space).
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

Remarks

On physical or electronic remote control devices, there is often a group of four directional buttons used for certain types of operations (such as menu navigation). This method tells DirectShow that something (the user, probably) triggered the right directional button.

"Selecting" a DVD button simply highlights the button but does not "activate" the button. Selecting is the Windows equivalent of tabbing to a button but not pressing the space bar or enter key. Activating is the Windows equivalent of pressing the space bar or enter key after tabbing to a button.

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IDvdControl::SetRoot

IDvdControl Interface

Sets the root directory containing the DVD-Video volume.

HRESULT SetRoot(
  LPCWSTR pszPath );

Parameters

pszPath

[in] Directory name to set as the root directory.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Input argument is invalid.
E_NOTIMPL	Method is not supported.
E_POINTER	NULL pointer argument.
S_OK	Success.

Remarks

The current state must be DVD_DOMAIN_Stop when you call this method.

If you haven't set the root directory before calling IDvdControl::TitlePlay, the first drive starting from C: that contains a VIDEO_TS directory in the top level directory will be used as the root.

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IDvdControl::StillOff

IDvdControl Interface

Resumes playback, cancelling still mode.

HRESULT StillOff( );

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_NOTIMPL	Method is not supported.
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

Remarks

If the display image wasn't in still-store mode, this method does nothing.

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IDvdControl::StopForResume

IDvdControl Interface

Transitions playback to the DVD_DOMAIN_Stop state after saving resume information.

HRESULT StopForResume(void);

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_NOTIMPL	Method is not supported.
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

Remarks

If no file is playing or paused, this method does nothing.

The DVD Navigator filter transfers to the stopped state, but the filter graph remains in DirectShow's Run state.

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IDvdControl::SubpictureStreamChange

IDvdControl Interface

Enables or disables picture-in-picture mode and sets the subpicture to the specified source.

HRESULT SubpictureStreamChange(
  ULONG nSubPicture,
  BOOL bDisplay
  );

Parameters

nSubPicture

Value that specifies the source of the subpicture, which must be between 0 and 31, or 63.

bDisplay

Boolean value that specifies whether the subpicture is enabled; TRUE makes the subpicture visible and FALSE hides it.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Input argument is invalid.
E_NOTIMPL	Method is not supported.
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

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IDvdControl::TimePlay

IDvdControl Interface

Plays the media file with the specified title index, starting at the specified time.

HRESULT TimePlay(
  ULONG uiTitle,
  ULONG bcdTime
  );

Parameters

uiTitle

Value that specifies the title number DirectShow will play back; this value must be between 1 and 99.

bcdTime

Pointer to the DVD_TIMECODE structure where DirectShow will start playback.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Input argument is invalid.
E_NOTIMPL	Method is not supported.
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

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IDvdControl::TimeSearch

IDvdControl Interface

Halts playback of the current chapter and starts playback from the specified time in the same media file.

HRESULT TimeSearch(
  ULONG bcdTime
  );

Parameters

bcdTime

Pointer to the DVD_TIMECODE structure where DirectShow will start playback.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Input argument is invalid.
E_NOTIMPL	Method is not supported.
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

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IDvdControl::TitlePlay

IDvdControl Interface

Finds the media file with the specified title index and plays it back.

HRESULT TitlePlay(
  ULONG uiTitle
  );

Parameters

uiTitle

Value that specifies the title number DirectShow will play back; this value must be between 1 and 99.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Input argument is invalid.
E_NOTIMPL	Method is not supported.
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

---

IDvdControl::TopPGSearch

IDvdControl Interface

Halts playback of the current chapter and restarts playback of the current chapter within the title.

HRESULT TopPGSearch( );

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_NOTIMPL	Method is not supported.
E_UNEXPECTED	DVD is not initialized.
S_OK	Success.

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IDvdControl::UpperButtonSelect

IDvdControl Interface

Selects the upper directional button from the displayed menu.

HRESULT UpperButtonSelect( );

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_NOTIMPL	Method is not supported.
S_OK	Success.

Remarks

On physical or electronic remote control devices, there is often a group of four directional buttons used for certain types of operations (such as menu navigation). This method tells DirectShow that something (the user, probably) triggered the upper directional button.

"Selecting" a DVD button simply highlights the button but does not "activate" the button. Selecting is the Windows equivalent of tabbing to a button but not pressing the space bar or enter key. Activating is the Windows equivalent of pressing the space bar or enter key after tabbing to a button.

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IDvdControl::VideoModePreferrence

IDvdControl Interface

Sets the video display mode the user prefers.

HRESULT VideoModePreferrence(
  ULONG ulPreferredDisplayMode
  );

Parameters

ulPreferredDisplayMode

[in] Value that specifies the new display mode for DVD content. Member of the DVD_PREFERRED_DISPLAY_MODE enumerated data type.

Return Values

Returns an HRESULT value that depends on the implementation of the interface. Typical return values might include one of the following:

Value	Meaning
E_FAIL	Failure.
E_INVALIDARG	Input argument is invalid.
E_NOTIMPL	Method is not supported.
S_OK	Success.

Remarks

This method changes the default video window's aspect ratio, and may also specify a default aspect ratio conversion mechanism.

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