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Play Songs using sound generator

Posted on 2004-08-26
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Play Songs using sound generator

How to Play Songs using sound generator ?

Play Sound (Sound Generator) Example :

uses
  MMSystem;

type
  TVolumeLevel = 0..127;

procedure MakeSound(Frequency{Hz}, Duration{mSec}: Integer; Volume: TVolumeLevel);
  {writes tone to memory and plays it}
var
  WaveFormatEx: TWaveFormatEx;
  MS: TMemoryStream;
  i, TempInt, DataCount, RiffCount: integer;
  SoundValue: byte;
  w: double; // omega ( 2 * pi * frequency)
const
  Mono: Word = $0001;
  SampleRate: Integer = 11025; // 8000, 11025, 22050, or 44100
  RiffId: string = 'RIFF';
  WaveId: string = 'WAVE';
  FmtId: string = 'fmt ';
  DataId: string = 'data';
begin
  if Frequency > (0.6 * SampleRate) then
  begin
    ShowMessage(Format('Sample rate of %d is too Low to play a tone of %dHz',
      [SampleRate, Frequency]));
    Exit;
  end;
  with WaveFormatEx do
  begin
    wFormatTag := WAVE_FORMAT_PCM;
    nChannels := Mono;
    nSamplesPerSec := SampleRate;
    wBitsPerSample := $0008;
    nBlockAlign := (nChannels * wBitsPerSample) div 8;
    nAvgBytesPerSec := nSamplesPerSec * nBlockAlign;
    cbSize := 0;
  end;
  MS := TMemoryStream.Create;
  with MS do
  begin
    {Calculate length of sound data and of file data}
    DataCount := (Duration * SampleRate) div 1000; // sound data
    RiffCount := Length(WaveId) + Length(FmtId) + SizeOf(DWORD) +
      SizeOf(TWaveFormatEx) + Length(DataId) + SizeOf(DWORD) + DataCount; // file data
    {write out the wave header}
    Write(RiffId[1], 4); // 'RIFF'
    Write(RiffCount, SizeOf(DWORD)); // file data size
    Write(WaveId[1], Length(WaveId)); // 'WAVE'
    Write(FmtId[1], Length(FmtId)); // 'fmt '
    TempInt := SizeOf(TWaveFormatEx);
    Write(TempInt, SizeOf(DWORD)); // TWaveFormat data size
    Write(WaveFormatEx, SizeOf(TWaveFormatEx)); // WaveFormatEx record
    Write(DataId[1], Length(DataId)); // 'data'
    Write(DataCount, SizeOf(DWORD)); // sound data size
    {calculate and write out the tone signal} // now the data values
    w := 2 * Pi * Frequency; // omega
    for i := 0 to DataCount - 1 do
    begin
      SoundValue := 127 + trunc(Volume * sin(i * w / SampleRate)); // wt = w * i / SampleRate
      Write(SoundValue, SizeOf(Byte));
    end;
    {now play the sound}
    sndPlaySound(MS.Memory, SND_MEMORY or SND_SYNC);
    MS.Free;
  end;
end;

// How to call the function:

procedure TForm1.Button1Click(Sender: TObject);
begin
  MakeSound(1200, 1000, 60);
end;
0
Comment
Question by:sasabistrovic
  • 4
  • 2
6 Comments
 
LVL 12

Expert Comment

by:Ivanov_G
ID: 11907511
I am not sure I got your question... The code you have is working just fine... You have to include it in the appropriate places...

unit Unit1;

interface

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

type

  TVolumeLevel = 0..127;

  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure MakeSound(Frequency{Hz}, Duration{mSec}: Integer; Volume: TVolumeLevel);
  {writes tone to memory and plays it}
var
  WaveFormatEx: TWaveFormatEx;
  MS: TMemoryStream;
  i, TempInt, DataCount, RiffCount: integer;
  SoundValue: byte;
  w: double; // omega ( 2 * pi * frequency)
const
  Mono: Word = $0001;
  SampleRate: Integer = 11025; // 8000, 11025, 22050, or 44100
  RiffId: string = 'RIFF';
  WaveId: string = 'WAVE';
  FmtId: string = 'fmt ';
  DataId: string = 'data';
begin
  if Frequency > (0.6 * SampleRate) then
  begin
    ShowMessage(Format('Sample rate of %d is too Low to play a tone of %dHz',
      [SampleRate, Frequency]));
    Exit;
  end;
  with WaveFormatEx do
  begin
    wFormatTag := WAVE_FORMAT_PCM;
    nChannels := Mono;
    nSamplesPerSec := SampleRate;
    wBitsPerSample := $0008;
    nBlockAlign := (nChannels * wBitsPerSample) div 8;
    nAvgBytesPerSec := nSamplesPerSec * nBlockAlign;
    cbSize := 0;
  end;
  MS := TMemoryStream.Create;
  with MS do
  begin
    {Calculate length of sound data and of file data}
    DataCount := (Duration * SampleRate) div 1000; // sound data
    RiffCount := Length(WaveId) + Length(FmtId) + SizeOf(DWORD) +
      SizeOf(TWaveFormatEx) + Length(DataId) + SizeOf(DWORD) + DataCount; // file data
    {write out the wave header}
    Write(RiffId[1], 4); // 'RIFF'
    Write(RiffCount, SizeOf(DWORD)); // file data size
    Write(WaveId[1], Length(WaveId)); // 'WAVE'
    Write(FmtId[1], Length(FmtId)); // 'fmt '
    TempInt := SizeOf(TWaveFormatEx);
    Write(TempInt, SizeOf(DWORD)); // TWaveFormat data size
    Write(WaveFormatEx, SizeOf(TWaveFormatEx)); // WaveFormatEx record
    Write(DataId[1], Length(DataId)); // 'data'
    Write(DataCount, SizeOf(DWORD)); // sound data size
    {calculate and write out the tone signal} // now the data values
    w := 2 * Pi * Frequency; // omega
    for i := 0 to DataCount - 1 do
    begin
      SoundValue := 127 + trunc(Volume * sin(i * w / SampleRate)); // wt = w * i / SampleRate
      Write(SoundValue, SizeOf(Byte));
    end;
    {now play the sound}
    sndPlaySound(MS.Memory, SND_MEMORY or SND_SYNC);
    MS.Free;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  MakeSound(1200, 1000, 60);
end;

end.
0
 
LVL 12

Expert Comment

by:Ivanov_G
ID: 11907545
"How to Play Songs using sound generator ?" - aaa, sorry, I didn't red this line.

So, basically you should have the melody. Maybe you can get some song written on paper
Frequency  - tone
Duration     - tempp
Volume      - the octave
Using these 3 values, you can play a single note from the song...
0
 

Author Comment

by:sasabistrovic
ID: 11911517
Thanks.

How to organize (in Delphi code) single notes from the (existing ! ! ! ! !) song (for example took from CD) and plaied with sound generator ?
0
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LVL 12

Expert Comment

by:Ivanov_G
ID: 11911677
with this generators you can not play song from CD. in the most music formats, there are some channels, bit-rates, etc.

This is useful if you are going to play something simple like ringtone for cell phone and stuff like that.

The notes can be written by musician, I not capable to provide you with notes...
0
 

Author Comment

by:sasabistrovic
ID: 11915076
OK, Thanks. If my way is wrong to play song from CD, I have one more question.
I tried to get small parts of song from CD. Something like frequency and it's volume from each small part of song in the CD.
There is MMTools and TMMPeakDetect which does that ! ! ! ! !
I thought that that was the right way ! ! ! ! !

I thought that TMMPeakDetect gets frequency volume (from songs in WAV, MP3, CD) and TMMGenerator's sets (to play song in the way how get it TMMPeakDetect) it ! ! ! ! !

But I don't know how ! ! ! ! !

So You tell me that that is wrong ?

Thanks.
0
 
LVL 12

Accepted Solution

by:
Ivanov_G earned 500 total points
ID: 11918118
1) "If my way is wrong to play song from CD"
your way is definitelly wrong. All you need is TMediaPlayer component - it is found on System tab...

2) "I tried to get small parts of song from CD"
it seems you need some thing much more like CDRipper component. Check on www.torry.net
0

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