Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Sound vs. no sound

Posted on 2004-04-09
7
Medium Priority
?
185 Views
Last Modified: 2012-05-04
If I'm playing a video with the mediaplayers, how do I turn the sound off?..... and back on?  (D5)

          Thanks
0
Comment
Question by:jexd99
  • 2
  • 2
7 Comments
 
LVL 11

Expert Comment

by:shaneholmes
ID: 10794758
WHat are you using to play the Video with (TMediaPlayer)?

Shane
0
 
LVL 11

Expert Comment

by:shaneholmes
ID: 10794907
OK, well, if you are using TMediaPlayer:

The two key functions are waveOutSetVolume and waveOutGetVolume in
MMSystem.  The trick is to get the Device ID for use with those
functions.  This program uses the MediaPlayer component for that.

WaveOutSetVolume(hwo: Integer; dwVolume: Cardinal);

hwo is MediaPlayer1.DeviceId,

example:                           Right\/ | Left\/
dwVolume for Full L+R = $FFFFFFFF
dwVolume for Full L no R = $0000FFFF
dwVolume for Full R no L = $FFFF0000
dwVolume for no sound = $00000000

notice that the hi-order word refers to right channel and
lo-order word to left channel...
If use to set a mono soundcard, u specify the lo-order word
only.

WaveOutGetVolume retrieves the volume settings.



program Volume;

uses
  Forms,
  VolMain in 'VolMain.pas' {Main};

{$R *.RES}

begin
  Application.Initialize;
  Application.CreateForm(TMain, Main);
  Application.Run;
end.

---------------------------

unit VolMain;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,
Dialogs,
  StdCtrls, MMSystem, MPlayer;

type
  TMain = class(TForm)
    Button1: TButton;
    Slide: TScrollBar;
    Button2: TButton;
    VolSet: TStaticText;
    Label3: TLabel;
    MPlay: TMediaPlayer;
    Label2: TLabel;
    ID: TStaticText;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure SlideChange(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Main   : TMain;                                    // Form created
by Delphi
  MMCode : MMResult;                                 // Return value
used by MMSystem
  Vol    : DWord;                                    // Volume setting

implementation

{$R *.DFM}

// Horizontal ScrollBar Change Event
procedure TMain.SlideChange(Sender: TObject);
begin
  VolSet.Caption := IntToStr(Slide.Position);        // Display
current volume
  Vol := MakeLong(Slide.Position,Slide.Position);    // Store in both
halves
  MMCode := waveOutSetVolume(MPlay.DeviceID, Vol);   // Change volume
setting
end;

// Form OnCreate Event
procedure TMain.FormCreate(Sender: TObject);
begin
  MPlay.FileName := 'SoundFil.WAV';                  // Assign & Open
a file
  MPlay.Open;
  ID.Caption := IntToStr(MPlay.DeviceID);            // Get Device ID
from MediaPlayer
  MMCode := waveOutGetVolume(MPlay.DeviceID, @Vol);  // Get current
volume setting
  Slide.Position := Vol And $0000FFFF;               // Set the slider
to this setting
  VolSet.Caption := IntToStr(Slide.Position);        // Display
current volume
end;

// Play Button OnClick Event
procedure TMain.Button1Click(Sender: TObject);
begin
  MPlay.Play;                                        // Play the
current sound file
end;

// Exit Button Onclick
procedure TMain.Button2Click(Sender: TObject);
begin
  MPlay.Close;                                       // Close the
media player
  Close;                                             // Close the
application
end;

end.


OR of course, you could just use a Volumn Component. There are many of them on Delphi Super Page, or ww.Torry.net

Shane
0
 

Author Comment

by:jexd99
ID: 10795301

What am I missing here?  Shouldn't this play the video with the sound off?  (I'm running this no XP)    
----------------

           with MediaPlayer1 do begin
             try
               FileName := 'c:\test\test.mpg';
               Open;
               ID.Caption := IntToStr(MediaPlayer1.DeviceID);  
               WaveOutSetVolume(MediaPlayer1.DeviceID,$00000000);
               play;
             except
                showmessage('error');
             end;
           end;
0
 

Author Comment

by:jexd99
ID: 10795305
Whoops, typo.... "on XP"   :)
0
 

Accepted Solution

by:
modulo earned 0 total points
ID: 13284879
PAQed with points refunded (125)

modulo
Community Support Moderator
0

Featured Post

[Webinar] Cloud Security

In this webinar you will learn:

-Why existing firewall and DMZ architectures are not suited for securing cloud applications
-How to make your enterprise “Cloud Ready”, and fix your aging DMZ architecture
-How to transform your enterprise and become a Cloud Enabler

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Hello everybody This Article will show you how to validate number with TEdit control, What's the TEdit control? TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text. Usua…
Introduction I have seen many questions in this Delphi topic area where queries in threads are needed or suggested. I know bumped into a similar need. This article will address some of the concepts when dealing with a multithreaded delphi database…
Video by: ITPro.TV
In this episode Don builds upon the troubleshooting techniques by demonstrating how to properly monitor a vSphere deployment to detect problems before they occur. He begins the show using tools found within the vSphere suite as ends the show demonst…
Despite its rising prevalence in the business world, "the cloud" is still misunderstood. Some companies still believe common misconceptions about lack of security in cloud solutions and many misuses of cloud storage options still occur every day. …

885 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question