Record a device out

[msavigo1]

Hello,

I am able to record the input of a device using:

uos_AddFromDevIn(PlayerIndex, DEVICE, -1, -1, -1, -1, -1, -1);

In this case the DEVICE = 7 (default).
This device is for input and output.
The input is my microphone.
The output is my speaker.

I can't find a method like AddFromDevOut to record all output of my speaker.
Is it possible to record the output of a device?

[fredvs]

> Is it possible to record the output of a device?

Huh, that's the question I feared...

It is not easy because of synchronization problems.
It is on the TODO list.

Maybe you can try with a custom DSP (like you use for recording blocks).

Fre;D

[fredvs]

What OS are you using ?

If you use Windows XP, there is a "record what you hear" parameter for input.
If you use that input you will record all what goes to your sound-card.

IMHO with Windows 7, 8, 10 it is not possible "out of the box".
Sure it must exist tips but I do not know this.

For Linux, with Pulse-audio you may create a virtual input and assign the output of the sound card.
In my Linux Manjaro, I have to select :

"Monitor of Audio Interne Stereo Analogique."



That way, the input is the output of the sound card (and not the microphone or aux)

Fre;D

[Dibo]

Any progress here? I'm also starting app which need to "record what you hear". I have two problems:
1. I'm linux user and here I solved this with "Monitor of Internal Audio Stereo Analog" but I have to do it manually each time when I start recording :/ . Pavucontrol doesn't remember it
2. Didn't test windows yet, but here it is called WASAPI and works on all versions. Seems that PortAudio has support for it so it will also work with UOS?

[fredvs]

Hello Dibo.

> Seems that PortAudio has support for it so it will also work with UOS?

If PortAudio support it, uos will do it also!

Do you have a idea how Portaudio does it, what method does it use?

Thanks.

Fre;D

[fredvs]

Re-hello Dibo.

> Pavucontrol doesn't remember it

https://askubuntu.com/questions/166953/how-to-make-pavucontrol-changes-permanent

Maybe using pavucontrol for Linux and find something for Windows and then add it in uos ?

Fre;D

[Dibo]

Here someone mentioning about portaudio hosts:
https://forum.lazarus.freepascal.org/index.php/topic,17521.msg113061.html#msg113061

  PaHostApiTypeId =(paInDevelopment := 0,
    paDirectSound := 1,    
    paMME := 2,
    paASIO := 3,
    paSoundManager := 4,
    paCoreAudio := 5,
    paOSS := 7,
    paALSA := 8,
    paAL := 9,
    paBeOS := 10,
    paWDMKS := 11,
    paJACK := 12,
    paWASAPI := 13,
    paAudioScienceHPI := 14
  );

As you can see there is paWASAPI so maybe it is only a matther of set that type on windows and it will work automatically with uos?

[fredvs]

Hello Dibo.

> Here someone mentioning about portaudio hosts:

Yes, of course uos use that portaudio-hosts, but, afaik, PortAudio can give info and switch to a installed host but NOT change the input ("What you hear" / mic / line-in).

This can be done with the audio drivers (alsa or pulse-audio).

So, till now, I only see using pavucontrol.

Of course if you have other ideas, they are welcome.

Fre;D

[fredvs]

Re-hello Dibo.

There is a command-line for pavucontrol : pacmd and pactl.

Maybe using pacmd/pactl in uos could do the trick?

What do you think?

Fre;D