[pulseaudio-discuss] {PATCH][RFC] AC3 passthrough support

Michael Rans mcarans at yahoo.co.uk
Tue Jul 13 11:53:38 PDT 2010

# Encode AC3 -> Directly on hardware
# with Rate Converter to 48kHz, needed for some applications
pcm.a52 {
    @args [ CARD ]
    @args.CARD {
        type integer
    type rate
    slave {
        pcm {
            type a52
            bitrate 448
            channels 6
            card $CARD
        rate 48000

If I replace $CARD with 0 (manually), the above works - does anyone know why it 
doesn't work when I leave the $CARD there - shouldn't it get it from Pulseaudio 
when udev tries a52:0 ? Or is this not the correct way to do it?


From: pl bossart <bossart.nospam at gmail.com>
To: General PulseAudio Discussion <pulseaudio-discuss at mail.0pointer.de>
Sent: Mon, 12 July, 2010 23:14:06
Subject: Re: [pulseaudio-discuss] {PATCH][RFC] AC3 passthrough support

> This may be an obvious question, but what is the
> @args.0 {
>     type integer
>     }
> for?
> Is that what you meant by "Adding the argument removes the need to exit the
> profile." and if you did, I didn't understand at what point I had to exit
> the profile. Can you explain? Sorry if I'm being stupid.

Oops, this is a typo. 'edit' the profile I meant, not exit You can
keep a52:0 in the profile definition, no need to change pulseaudio
configuration files.
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