Re: How to mix multiple pcm capture stream into one and save to wav file as if it's from one single multi channel alsa card device

[Geraldo Nascimento <geraldogabriel@gmail.com>]

Hi Semyid,

On Thu, Apr 27, 2023 at 05:53:17AM -0000, semiydsemiyd@163.com wrote:
> now...i want to open all the devices at the same time. and have them save to one single wav file. As if i'm opening one single alsa capture device with  8 channels.
> the saved wav file should look something like this (take this 8 channel wav file for example)
> 
>  First Multichannel Sample 
>  --------------------------
> {BB FF FF}  3 bytes slot1
> {A1 FF FF}  3 bytes slot2
> {00 00 00}  3 bytes slot3
> {00 00 00}  3 bytes slot4
> {00 00 00}  3 bytes slot5
> {00 00 00}  3 bytes slot6
> {00 00 00}  3 bytes slot7
> {00 00 00}  3 bytes slot8
> 
> Second Multichannel Sample
>  --------------------------
> {E6 FF FF}  3 bytes slot1
>  .,.. etc ....
> 
> 
> Is this possible and if yes how can i do that?
>

For such a task usually I'd use JACK on top of ALSA with the
alsa_in/alsa_out scripts or the Zita tools.

Good luck,
Geraldo Nascimento

> thank you guys
> 
> 
> semiyd