From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Sebastian H." <vand2@gmx.de>
Subject: Re: How to save playback out in a file too
Date: Mon, 17 Oct 2011 11:56:57 +0200
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> Hi,
>  I want to same output of playback in a file.
> 
> We are developing IEC958 device but to debug want to save output of IEC958
> plug in a file.
> 
> Please suggest how to do that?

You could use the "file" plugin.
Extend your ~/.asoundrc with something like

pcm.write_file {
	type file
	slave {
		pcm hw:0
	}
	file "/home/user/alsafile.wav"
	format "wav"
}


Then use the "write_file" device for playback.
E.g. for mplayer
mplayer -ao alsa:device=write_file myvideo.mkv

Sebastian