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

[pl bossart]

> Even with this fix, the sink doesn't seem to do anything:

Actually discard this comment, it looks like it's crunching data if
you specify the rate in asound.conf.

# Encode AC3 -> Directly on hardware
pcm.Filter_A52Encode {
    type a52
    bitrate 448
    channels 6
}

# Rate Converter to 48kHz, needed for some applications
pcm.a52 {
    @args.0 {
	type integer
    }
    type rate
    slave {
        pcm "Filter_A52Encode"
        rate 48000
    }
}

Adding the argument removes the need to exit the profile.
It's really odd that the rate plugin is required even though
everything is already configured at 48kHz.
I will test tomorrow and if this is fine then I'll prepare a patch for
upstream. Thanks for doing the groundwork for this bug.