←Select platform

PlayBackwards Method

Summary

Plays the current title in reverse from the current location and at the specified speed.

Syntax

C++

public void PlayBackwards(  
   double speed 
)

Public Sub PlayBackwards( _ 
   ByVal speed As Double _ 
)

public: 
void PlayBackwards(  
   double speed 
)

Parameters

speed
The value representing the reverse playback speed. This is a multiplier value, where 1.0 means the original speed, 2.0 means twice the original speed, and 0.5 means half the original speed.

Remarks

This method does not support command synchronization. For more information on the options available when playing DVDs in LEADTOOLS Multimedia, refer to DVD Playback . For more detailed information, refer to the Microsoft documentation for IDvdControl2.PlayBackwards.

Example

using Leadtools; 
using Leadtools.Multimedia; 
using LeadtoolsMultimediaExamples.Fixtures; 
 
public bool _result = false; 
public PlayCtrlForm _form = new PlayCtrlForm(); 
public PlayCtrl _playctrl; 
 
public void IsAudioStreamEnabledExample() 
{ 
   // reference the play control 
   _playctrl = _form.PlayCtrl; 
 
   string inFile = Path.Combine(LEAD_VARS.MediaDir, @"VIDEO_TS\VIDEO_TS.IFO"); 
 
   try 
   { 
      // set auto start off 
      _playctrl.AutoStart = false; 
 
      // use DVDSource 
      _playctrl.UseDVDSource = true; 
 
      // set the input file 
      _playctrl.SourceFile = inFile; 
 
      // check the DVD options 
      DvdInfoCheck(); 
 
      // play it 
      _playctrl.Run(); 
   } 
   catch (Exception) 
   { 
      _result = false; 
   } 
 
   // we'll loop on the state and pump messages for this example. 
   // but you should not need to if running from a Windows Forms application. 
   while (_playctrl.State == PlayState.Running) 
      Application.DoEvents(); 
} 
 
// check DVD properties and info 
private void DvdInfoCheck() 
{ 
   string bstrVal; 
   int val; 
   int button = _playctrl.DvdController.CurrentButton; 
 
   val = _playctrl.DvdController.GetButtonWidth(button); 
   val = _playctrl.DvdController.GetButtonHeight(button); 
   val = _playctrl.DvdController.GetButtonLeft(button); 
   val = _playctrl.DvdController.GetButtonTop(button); 
 
   val = _playctrl.DvdController.DefaultMenuLanguage; 
   _playctrl.DvdController.DefaultMenuLanguage = 1033; 
   val = _playctrl.DvdController.GetNumberOfChapters(0); 
   val = _playctrl.DvdController.TotalTitleTime; 
 
   DVDTimecodeFlags tcFlags = _playctrl.DvdController.TitleTimecodeFlags; 
 
   val = _playctrl.DvdController.CurrentAngle; 
   if (_playctrl.DvdController.AnglesAvailable > 1) 
      _playctrl.DvdController.CurrentAngle = 2; 
 
   DVDValidUserOp userOp = _playctrl.DvdController.CurrentUOPS; 
   long audioLang = _playctrl.DvdController.GetAudioLanguage(0); 
 
   val = _playctrl.DvdController.CurrentAudioStream; 
   if (_playctrl.DvdController.AudioStreamsAvailable > 1) 
      _playctrl.DvdController.CurrentAudioStream = 2; 
 
   val = _playctrl.DvdController.CurrentTime; 
   val = _playctrl.DvdController.CurrentVolume; 
   val = _playctrl.DvdController.VolumesAvailable; 
   val = _playctrl.DvdController.TitlesAvailable; 
   bool enabled = _playctrl.DvdController.IsAudioStreamEnabled(0); 
   val = _playctrl.DvdController.DefaultAudioLanguage; 
 
   _playctrl.DvdController.SelectDefaultAudioLanguage(1033, DVDAudioLangExt.Captions); 
 
   string directory = _playctrl.DvdController.DVDDirectory; 
   val = _playctrl.DvdController.CurrentSubpictureStream; 
   val = _playctrl.DvdController.SubpictureStreamsAvailable; 
   if ((val > 1)) 
   { 
      _playctrl.DvdController.CurrentSubpictureStream = 1; 
   } 
   val = _playctrl.DvdController.DefaultSubpictureLanguage; 
   _playctrl.DvdController.SelectDefaultSubpictureLanguage(1033, DVDSubpictureLangExt.Caption_Normal); 
 
   val = _playctrl.DvdController.CurrentTitle; 
 
   DVDSubpictureLangExt subPicLangExt = _playctrl.DvdController.DefaultSubpictureLanguageExt; 
 
   DVDAudioLangExt audioLangExt = _playctrl.DvdController.DefaultAudioLanguageExt; 
   long subpicLang = _playctrl.DvdController.GetSubpictureLanguage(0); 
   bool subPicStream = _playctrl.DvdController.IsSubpictureStreamEnabled(0); 
 
   val = _playctrl.DvdController.GetDVDTextLanguageLCID(0); 
   val = _playctrl.DvdController.DVDTextNumberOfLanguages; 
   val = _playctrl.DvdController.GetGPRM(0); 
   _playctrl.DvdController.SetGPRM(0, 1); 
 
   val = _playctrl.DvdController.GetDVDTextNumberOfStrings(0); 
   val = _playctrl.DvdController.ButtonsAvailable; 
   val = _playctrl.DvdController.PlayerParentalLevel; 
   val = _playctrl.DvdController.PlayerParentalCountry; 
   string ppCountry = string.Format("{0}{1}", (char)(val & 0xFF), (char)(val >> 8)); 
 
   if (ppCountry != "US") 
   { 
      val = (int)'U'; 
      val += ((int)'S' << 8); 
      _playctrl.DvdController.SelectParentalCountry(val, "user", "pwd"); 
   } 
   val = _playctrl.DvdController.GetTitleParentalLevels(-1); 
   _playctrl.DvdController.SelectParentalLevel(9, "user", "pwd"); 
 
   DVDDomain domain = _playctrl.DvdController.CurrentDomain; 
   DVDDiscSide diskSide = _playctrl.DvdController.CurrentDiscSide; 
 
   val = _playctrl.DvdController.CurrentChapter; 
   DVDTextStringType textStrType = _playctrl.DvdController.GetDVDTextStringType(0, 0); 
   if (!_playctrl.DvdController.SubpictureOn) 
      _playctrl.DvdController.SubpictureOn = true; 
 
   val = _playctrl.DvdController.GetSPRM(0); 
   bstrVal = _playctrl.DvdController.GetDVDTextString(0, 0); 
   bstrVal = _playctrl.DvdController.DVDUniqueID; 
} 
 
// menu event helpers for DVD navigation and control 
private void mnAcceptParentalLevelChange_Click() 
{ 
   _playctrl.DvdController.AcceptParentalLevelChange(true); 
} 
 
private void mnActivateAtPosition_Click() 
{ 
   _playctrl.DvdController.ActivateAtPosition(10, 10); 
} 
 
private void mnActivateButton_Click() 
{ 
   _playctrl.DvdController.ActivateButton(); 
} 
 
private void mnChangeDVDRegion_Click() 
{ 
   _playctrl.DvdController.ChangeDVDRegion(_form); 
} 
 
private void mnNotifyParentalLevelChange_Click() 
{ 
   _playctrl.DvdController.NotifyParentalLevelChange(true); 
} 
 
private void mnPause_Click() 
{ 
   _playctrl.DvdController.Pause(true); 
} 
 
private void mnPlayAtInTitle_Click() 
{ 
   _playctrl.DvdController.PlayAtTimeInTitle(1, 10000000); 
} 
 
private void mnPlayAtTime_Click() 
{ 
   _playctrl.DvdController.PlayAtTime(10000000); 
} 
 
private void mnPlaybackword_Click() 
{ 
   _playctrl.DvdController.PlayBackwards(5); 
} 
 
private void mnPlayChapter_Click() 
{ 
   _playctrl.DvdController.PlayChapter(1); 
} 
 
private void mnPlaychapterautostop_Click() 
{ 
   _playctrl.DvdController.PlayChaptersAutoStop(1, 2, 5); 
} 
 
private void mnPlaychapterintitle_Click() 
{ 
   _playctrl.DvdController.PlayChapterInTitle(1, 3); 
} 
 
private void mnPlayfowrward_Click() 
{ 
   _playctrl.DvdController.PlayForwards(5); 
} 
 
private void mnPlayNextChapter_Click() 
{ 
   _playctrl.DvdController.PlayNextChapter(); 
} 
 
private void mnPlayperiod_Click() 
{ 
   _playctrl.DvdController.PlayPeriodInTitleAutoStop(1, 30, 120); 
} 
 
private void mnPlayPrevChapter_Click() 
{ 
   _playctrl.DvdController.PlayPrevChapter(); 
} 
 
private void mnPlaytitle_Click() 
{ 
   _playctrl.DvdController.PlayTitle(1); 
} 
 
private void mnReplayChapter_Click() 
{ 
   _playctrl.DvdController.ReplayChapter(); 
} 
 
private void mnResume_Click() 
{ 
   _playctrl.DvdController.Resume(); 
} 
 
private void mnReturnfromsubmenu_Click() 
{ 
   _playctrl.DvdController.ReturnFromSubmenu(); 
} 
 
private void mnSelectAndActivateButton_Click() 
{ 
   _playctrl.DvdController.SelectAndActivateButton(1); 
} 
 
private void mnSelectAtPosition_Click() 
{ 
   _playctrl.DvdController.SelectAtPosition(10, 10); 
} 
 
private void mnSelectButton_Click() 
{ 
   _playctrl.DvdController.SelectButton(1); 
} 
 
private void mnSelectRelativeButton_Click() 
{ 
   _playctrl.DvdController.SelectRelativeButton(DVDRelativeButton.Right); 
} 
 
private void mnSetDVDDirectory_Click() 
{ 
   _playctrl.DvdController.DVDDirectory = @"e:\video_ts"; 
} 
 
private void mnShowMenu_Click() 
{ 
   _playctrl.DvdController.ShowMenu(DVDMenuId.Root); 
} 
 
private void mnStillOff_Click() 
{ 
   _playctrl.DvdController.StillOff(); 
} 
 
private void mnStop_Click() 
{ 
   _playctrl.DvdController.Stop(); 
} 
 
static class LEAD_VARS 
{ 
   public const string MediaDir = @"C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 19\Media"; 
}

Imports Leadtools 
Imports Leadtools.Multimedia 
Imports LeadtoolsMultimediaExamples.Fixtures 
 
Public _result As Boolean = False 
Public _form As PlayCtrlForm = New PlayCtrlForm() 
Public _playctrl As PlayCtrl 
 
Public Sub IsAudioStreamEnabledExample() 
   ' reference the play control 
   _playctrl = _form.PlayCtrl 
 
   Dim inFile As String = Path.Combine(LEAD_VARS.MediaDir, "VIDEO_TS\VIDEO_TS.IFO") 
 
   Try 
      ' set auto start off 
      _playctrl.AutoStart = False 
 
      ' use DVDSource 
      _playctrl.UseDVDSource = True 
 
      ' set the input file 
      _playctrl.SourceFile = inFile 
 
      ' check the DVD options 
      DvdInfoCheck() 
 
      ' play it 
      _playctrl.Run() 
   Catch e1 As Exception 
      _result = False 
   End Try 
 
   ' we'll loop on the state and pump messages for this example. 
   ' but you should not need to if running from a Windows Forms application. 
   Do While _playctrl.State = PlayState.Running 
      Application.DoEvents() 
   Loop 
End Sub 
 
' check DVD properties and info 
Private Sub DvdInfoCheck() 
   Dim bstrVal As String 
   Dim val As Integer 
   Dim button As Integer = _playctrl.DvdController.CurrentButton 
 
   val = _playctrl.DvdController.GetButtonWidth(button) 
   val = _playctrl.DvdController.GetButtonHeight(button) 
   val = _playctrl.DvdController.GetButtonLeft(button) 
   val = _playctrl.DvdController.GetButtonTop(button) 
 
   val = _playctrl.DvdController.DefaultMenuLanguage 
   _playctrl.DvdController.DefaultMenuLanguage = 1033 
   val = _playctrl.DvdController.GetNumberOfChapters(0) 
   val = _playctrl.DvdController.TotalTitleTime 
 
   Dim tcFlags As DVDTimecodeFlags = _playctrl.DvdController.TitleTimecodeFlags 
 
   val = _playctrl.DvdController.CurrentAngle 
   If _playctrl.DvdController.AnglesAvailable > 1 Then 
      _playctrl.DvdController.CurrentAngle = 2 
   End If 
 
   Dim userOp As DVDValidUserOp = _playctrl.DvdController.CurrentUOPS 
   Dim audioLang As Long = _playctrl.DvdController.GetAudioLanguage(0) 
 
   val = _playctrl.DvdController.CurrentAudioStream 
   If _playctrl.DvdController.AudioStreamsAvailable > 1 Then 
      _playctrl.DvdController.CurrentAudioStream = 2 
   End If 
 
   val = _playctrl.DvdController.CurrentTime 
   val = _playctrl.DvdController.CurrentVolume 
   val = _playctrl.DvdController.VolumesAvailable 
   val = _playctrl.DvdController.TitlesAvailable 
   Dim enabled As Boolean = _playctrl.DvdController.IsAudioStreamEnabled(0) 
   val = _playctrl.DvdController.DefaultAudioLanguage 
 
   _playctrl.DvdController.SelectDefaultAudioLanguage(1033, DVDAudioLangExt.Captions) 
 
   Dim directory As String = _playctrl.DvdController.DVDDirectory 
   val = _playctrl.DvdController.CurrentSubpictureStream 
   val = _playctrl.DvdController.SubpictureStreamsAvailable 
   If (val > 1) Then 
      _playctrl.DvdController.CurrentSubpictureStream = 1 
   End If 
   val = _playctrl.DvdController.DefaultSubpictureLanguage 
   _playctrl.DvdController.SelectDefaultSubpictureLanguage(1033, DVDSubpictureLangExt.Caption_Normal) 
 
   val = _playctrl.DvdController.CurrentTitle 
 
   Dim subPicLangExt As DVDSubpictureLangExt = _playctrl.DvdController.DefaultSubpictureLanguageExt 
 
   Dim audioLangExt As DVDAudioLangExt = _playctrl.DvdController.DefaultAudioLanguageExt 
   Dim subpicLang As Long = _playctrl.DvdController.GetSubpictureLanguage(0) 
   Dim subPicStream As Boolean = _playctrl.DvdController.IsSubpictureStreamEnabled(0) 
 
   val = _playctrl.DvdController.GetDVDTextLanguageLCID(0) 
   val = _playctrl.DvdController.DVDTextNumberOfLanguages 
   val = _playctrl.DvdController.GetGPRM(0) 
   _playctrl.DvdController.SetGPRM(0, 1) 
 
   val = _playctrl.DvdController.GetDVDTextNumberOfStrings(0) 
   val = _playctrl.DvdController.ButtonsAvailable 
   val = _playctrl.DvdController.PlayerParentalLevel 
   val = _playctrl.DvdController.PlayerParentalCountry 
   Dim ppCountry As String = String.Format("{0}{1}", CChar(ChrW(val And &HFF)), CChar(ChrW(val >> 8))) 
 
   If ppCountry <> "US" Then 
      val = CInt(AscW("U"c)) 
      val += (CInt(AscW("S"c)) << 8) 
      _playctrl.DvdController.SelectParentalCountry(val, "user", "pwd") 
   End If 
   val = _playctrl.DvdController.GetTitleParentalLevels(-1) 
   _playctrl.DvdController.SelectParentalLevel(9, "user", "pwd") 
 
   Dim domain As DVDDomain = _playctrl.DvdController.CurrentDomain 
   Dim diskSide As DVDDiscSide = _playctrl.DvdController.CurrentDiscSide 
 
   val = _playctrl.DvdController.CurrentChapter 
   Dim textStrType As DVDTextStringType = _playctrl.DvdController.GetDVDTextStringType(0, 0) 
   If (Not _playctrl.DvdController.SubpictureOn) Then 
      _playctrl.DvdController.SubpictureOn = True 
   End If 
 
   val = _playctrl.DvdController.GetSPRM(0) 
   bstrVal = _playctrl.DvdController.GetDVDTextString(0, 0) 
   bstrVal = _playctrl.DvdController.DVDUniqueID 
End Sub 
 
' menu event helpers for DVD navigation and control 
Private Sub mnAcceptParentalLevelChange_Click() 
   _playctrl.DvdController.AcceptParentalLevelChange(True) 
End Sub 
 
Private Sub mnActivateAtPosition_Click() 
   _playctrl.DvdController.ActivateAtPosition(10, 10) 
End Sub 
 
Private Sub mnActivateButton_Click() 
   _playctrl.DvdController.ActivateButton() 
End Sub 
 
Private Sub mnChangeDVDRegion_Click() 
   _playctrl.DvdController.ChangeDVDRegion(_form) 
End Sub 
 
Private Sub mnNotifyParentalLevelChange_Click() 
   _playctrl.DvdController.NotifyParentalLevelChange(True) 
End Sub 
 
Private Sub mnPause_Click() 
   _playctrl.DvdController.Pause(True) 
End Sub 
 
Private Sub mnPlayAtInTitle_Click() 
   _playctrl.DvdController.PlayAtTimeInTitle(1, 10000000) 
End Sub 
 
Private Sub mnPlayAtTime_Click() 
   _playctrl.DvdController.PlayAtTime(10000000) 
End Sub 
 
Private Sub mnPlaybackword_Click() 
   _playctrl.DvdController.PlayBackwards(5) 
End Sub 
 
Private Sub mnPlayChapter_Click() 
   _playctrl.DvdController.PlayChapter(1) 
End Sub 
 
Private Sub mnPlaychapterautostop_Click() 
   _playctrl.DvdController.PlayChaptersAutoStop(1, 2, 5) 
End Sub 
 
Private Sub mnPlaychapterintitle_Click() 
   _playctrl.DvdController.PlayChapterInTitle(1, 3) 
End Sub 
 
Private Sub mnPlayfowrward_Click() 
   _playctrl.DvdController.PlayForwards(5) 
End Sub 
 
Private Sub mnPlayNextChapter_Click() 
   _playctrl.DvdController.PlayNextChapter() 
End Sub 
 
Private Sub mnPlayperiod_Click() 
   _playctrl.DvdController.PlayPeriodInTitleAutoStop(1, 30, 120) 
End Sub 
 
Private Sub mnPlayPrevChapter_Click() 
   _playctrl.DvdController.PlayPrevChapter() 
End Sub 
 
Private Sub mnPlaytitle_Click() 
   _playctrl.DvdController.PlayTitle(1) 
End Sub 
 
Private Sub mnReplayChapter_Click() 
   _playctrl.DvdController.ReplayChapter() 
End Sub 
 
Private Sub mnResume_Click() 
   _playctrl.DvdController.Resume() 
End Sub 
 
Private Sub mnReturnfromsubmenu_Click() 
   _playctrl.DvdController.ReturnFromSubmenu() 
End Sub 
 
Private Sub mnSelectAndActivateButton_Click() 
   _playctrl.DvdController.SelectAndActivateButton(1) 
End Sub 
 
Private Sub mnSelectAtPosition_Click() 
   _playctrl.DvdController.SelectAtPosition(10, 10) 
End Sub 
 
Private Sub mnSelectButton_Click() 
   _playctrl.DvdController.SelectButton(1) 
End Sub 
 
Private Sub mnSelectRelativeButton_Click() 
   _playctrl.DvdController.SelectRelativeButton(DVDRelativeButton.Right) 
End Sub 
 
Private Sub mnSetDVDDirectory_Click() 
   _playctrl.DvdController.DVDDirectory = "e:\video_ts" 
End Sub 
 
Private Sub mnShowMenu_Click() 
   _playctrl.DvdController.ShowMenu(DVDMenuId.Root) 
End Sub 
 
Private Sub mnStillOff_Click() 
   _playctrl.DvdController.StillOff() 
End Sub 
 
Private Sub mnStop_Click() 
   _playctrl.DvdController.Stop() 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const MediaDir As String = "C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 19\Media" 
End Class