Solved

Sound vs. no sound

Posted on 2004-04-09
7
174 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

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

The uses clause is one of those things that just tends to grow and grow. Most of the time this is in the main form, as it's from this form that all others are called. If you have a big application (including many forms), the uses clause in the in…
Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
This tutorial gives a high-level tour of the interface of Marketo (a marketing automation tool to help businesses track and engage prospective customers and drive them to purchase). You will see the main areas including Marketing Activities, Design …
Along with being a a promotional video for my three-day Annielytics Dashboard Seminor, this Micro Tutorial is an intro to Google Analytics API data.

911 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

Need Help in Real-Time?

Connect with top rated Experts

19 Experts available now in Live!

Get 1:1 Help Now