10-29-2018, 03:33 AM
@4mayday
As I understand it, the Pi2Design 502DAC uses the Hifiberry DAC+ Pro kernel driver. This driver allows up to 384 kHz sample rates even though the hardware support may be flaky at such high rates. So the kernel driver is reporting that it is capable of 352 & 384 kHz to ALSA/MPD and therefore the output of the DSD2PCM module, which is fixed at 352.8 kHz, is not being resampled before being passed to the output.
From your original post, it appears you are using the 502DAC to output SPDIF or AES to another DAC. Is that right?
So what you want to do is fix an upper limit for sample rate compatibility to 192 kHz or maybe 96 kHz if you are having issues above that.
@Tim Curtis Can an upper limit be set in an ALSA config that overrides the kernel driver? I'm making the assumption here that ALSA is doing the SRC not MPD (libsamplerate).
As I understand it, the Pi2Design 502DAC uses the Hifiberry DAC+ Pro kernel driver. This driver allows up to 384 kHz sample rates even though the hardware support may be flaky at such high rates. So the kernel driver is reporting that it is capable of 352 & 384 kHz to ALSA/MPD and therefore the output of the DSD2PCM module, which is fixed at 352.8 kHz, is not being resampled before being passed to the output.
From your original post, it appears you are using the 502DAC to output SPDIF or AES to another DAC. Is that right?
So what you want to do is fix an upper limit for sample rate compatibility to 192 kHz or maybe 96 kHz if you are having issues above that.
@Tim Curtis Can an upper limit be set in an ALSA config that overrides the kernel driver? I'm making the assumption here that ALSA is doing the SRC not MPD (libsamplerate).
