On Nov 6, 2015, at 10:18 29, Wayne Merricks <[email protected]> wrote:
> Which maps nicely to 32bit Little Endian which is what is tried in CAED > first. On this USB device, it does advertise itself as a 24bit card. I > don't have the same info in hw_params but I have similar inside: > > cat /proc/asound/card0/stream0 > > Format: S24_3LE 24 bit “packed” mode —i.e. 6 bytes per stereo frame (as opposed to S24_LE, which is also 24 bit, but bit aligned into a 32 bit word). > I'm wondering whether this is an oversight in the CAED code. I don't > understand the C++ calls very well but inside cae_alsa.cpp on line 1548 > (github master) you have this function: Not an oversight so much as an intentional omission! This is the first such critter I’ve ever heard of. > These look like standard ALSA C Library functions and it effectively checks > for SND_PCM_FORMAT_S16/S32_LE on the card and returns 0 if it does. Would I > be correct in assuming Riv/Caed doesn't support 24bit cards? I’m thinking that you should be able to use the ALSA plug layer to make this work. In ‘/etc/asound.conf’, try adding a format line to the PCM config, something like this: *** snip snip *** pcm.rd0 type hw format S32_LE card 0 device 0 } *** snip snip *** Cheers! |----------------------------------------------------------------------| | Frederick F. Gleason, Jr. | Chief Developer | | | Paravel Systems | |----------------------------------------------------------------------| | A room without books is like a body without a soul. | | -- Cicero | |----------------------------------------------------------------------| _______________________________________________ Rivendell-dev mailing list [email protected] http://caspian.paravelsystems.com/mailman/listinfo/rivendell-dev
