DELPHI AREA Forum

Hi there,

I am working on an application that can record 2 different audiostreams to two different wave-files. Therefore i have installed 2 audio cards and i am using the component WaveAudio Version 1.52.

I have assigned AudioMixer0 to MixerId=0 and the second AudioMixer1 to MixerId=1 in the code, since one cannot set those at runtime. Besides those 2 components i am using WaveStorage (twice) and the StockAudioRecorder (twice). I have connected the WaveStorage and the StockAudioRecorder to eachother, but i cannot connect one of those components to a Mixer. This is where it goes wrong in my opinion, because i get an error as soon as i try to record the second audiostream. "Device is busy or something like that".

So, is there a workaround for this or am I doing something wrong?

Hi,

You have to use DeviceID property of the component to select the proper device on one of the mixers. Unfortunately, there's no straight way to find DeviceID's of a mixer. However, using the similarity between name of the Mixer and name of the Device you can find the right Device.

The following code lists the available input/output devices in two listboxes.

Code: Select all

uses
  mmSystem;

procedure TForm1.FormCreate(Sender: TObject);
var
  I: Integer;
begin
  // Lists the available input devices in the first ListBox
  ListBox1.Items.Clear;
  for I := Integer(WAVE_MAPPER) to AudioRecorder1.NumDevs - 1 do
  begin
    AudioRecorder1.DeviceID := I;
    ListBox1.Items.Add(AudioRecorder1.DeviceName);
  end;
  // Lists the available output devices in the second ListBox
  ListBox2.Items.Clear;
  for I := Integer(WAVE_MAPPER) to AudioPlayer1.NumDevs - 1 do
  begin
    AudioPlayer1.DeviceID := I;
    ListBox2.Items.Add(AudioPlayer1.DeviceName);
  end;
end;

By the way, the default value for DeviceID is WAVE_MAPPER (Microsoft Sound Mapper).

Kambiz

It's working! Great, thanks for the quick response. I got confused with the MixerId. I did not look good enough in the documentation to see that there was a DeviceID as well.

Thanks again!

but why this always make the sound as sterio mix and cant talk from microphone ?

drama22, it depends on your device's capabilities.