Dual output with differing samplerates?

[Daniel Smedegaard Buus <danielbuus@xxxxxxxxx>]

Hi :)

I'm trying to create an .asoundrc file for my box which will combine a
USB sound card output and the SPDIF output on an onboard Intel device.

Thing is, the USB card is a NAD DAC 1 device which _only_ support a
sample rate of 48 kHz. This card provides audio for my bedroom, while
in my livingroom I'm using an AudioAlchemy II DAC which supports both
44.1 kHz and 48 kHz sample rates. The audio going in to my box is
16/44.1 via Airplay, originating from CD-format music, i.e. the same.

Since the livingroom is where my "real" hifi equipment is, I'd rather
not do sample rate conversion on the source if at all avoidable.
Hence, I'm trying to create a config with 48 kHz conversion for the
NAD and none for the AA2.

Problem is, when I try to use it with the SPDIF out at 44.1, I get
"ALSA lib pcm_params.c:2162:(snd1_pcm_hw_refine_slave) Slave PCM not
usable". Works at 48 kHz.

Is this a limitation or am I just doing it wrong? Hope I'm not being a
retard (more than usual, anyway).

I've added my conf below. Hope to hear from someone. Thank you :)

Daniel



~/.asoundrc:



defaults.pcm.rate_converter "samplerate_best"

pcm.hifi plug:both

ctl.hifi {
        type hw
        card Intel
}

pcm.both {
        type route
        slave.pcm {
                type multi
                slaves.b.pcm aa2
                slaves.a.pcm nad
                slaves.a.channels 2
                slaves.b.channels 2
                bindings.0.slave a
                bindings.0.channel 0
                bindings.1.slave a
                bindings.1.channel 1
                bindings.2.slave b
                bindings.2.channel 0
                bindings.3.slave b
                bindings.3.channel 1
        }

        ttable.0.0 1;
        ttable.1.1 1;
        ttable.0.2 1;
        ttable.1.3 1;

}

ctl.both {
        type hw
        card Headset
}

pcm.aa2 {

        type dmix

        ipc_key 1024

        slave {

                pcm "hw:0,1"

                period_time 0

                period_size 1024

                buffer_time 0

                buffer_size 16384

                format S16_LE

                rate 48000

        }

        bindings {

                0 0

                1 1

        }

}

pcm.nad  {

        type dmix

        ipc_key 1025

        slave {

                pcm "hw:2,0"

                period_time 0

                period_size 1024

                buffer_time 0

                buffer_size 16384

                format S16_LE

                rate 48000

        }

        bindings {

                0 0

                1 1

        }

}

ctl.aa2 {
        type hw
        card Intel
}

ctl.nad {
        type hw
        card Headset
}

------------------------------------------------------------------------------
Dive into the World of Parallel Programming The Go Parallel Website, sponsored
by Intel and developed in partnership with Slashdot Media, is your hub for all
things parallel software development, from weekly thought leadership blogs to
news, videos, case studies, tutorials and more. Take a look and join the 
conversation now. http://goparallel.sourceforge.net/

_______________________________________________
Alsa-user mailing list
Alsa-user@xxxxxxxxxxxxxxxxxxxxx
https://lists.sourceforge.net/lists/listinfo/alsa-user