Re: Dice firewire support
Hi Pascal,
On Fri, May 22, 2020 at 12:51:45AM -0700, bomelp@gmail.com wrote:
Hi Takashi,
Sorry if i bother you about my mail. Actually, i try to enable a mytek dsd-192 dac via its firewire port on a debian 4.9.12. I saw you worked on snd-dice module.Do you have a step-by-step documentation to help me do that ?
Best regards Pascal France
Although I don't test the device, Melvin Vermeeren added support for Mytek Stereo 192 DSD-DAC in Linux kernel v4.18 firstly. It's not available in your kernel. https://www.alsa-project.org/pipermail/alsa-devel/2018-May/136194.html
If you can't work with the device just by loading snd-dice module in recent Linux kernel, please contact to me or Melvin ;)
Regards
Takashi Sakamoto
Thank you so much Takashi. Actually i have a debian 4.9.12 "stretch" release with 4.9.211 kernel version (uname -v) This kernel has snd-dice module inside isn't it ? I am not very familiar with linux, that's why i appreciate your help.
Regards,
Pascal Bomel
Le ven. 22 mai 2020 à 12:10, Takashi Sakamoto o-takashi@sakamocchi.jp a écrit :
Hi Pascal,
On Fri, May 22, 2020 at 12:51:45AM -0700, bomelp@gmail.com wrote:
Hi Takashi,
Sorry if i bother you about my mail. Actually, i try to enable a mytek dsd-192 dac via its firewire port on
a debian 4.9.12.
I saw you worked on snd-dice module.Do you have a step-by-step
documentation to help me do that ?
Best regards Pascal France
Although I don't test the device, Melvin Vermeeren added support for Mytek Stereo 192 DSD-DAC in Linux kernel v4.18 firstly. It's not available in your kernel. https://www.alsa-project.org/pipermail/alsa-devel/2018-May/136194.html
If you can't work with the device just by loading snd-dice module in recent Linux kernel, please contact to me or Melvin ;)
Regards
Takashi Sakamoto
Hi all,
On Friday, 22 May 2020 11:07:06 CEST Pascal Bomel wrote:
Thank you so much Takashi. Actually i have a debian 4.9.12 "stretch" release with 4.9.211 kernel version (uname -v) This kernel has snd-dice module inside isn't it ? I am not very familiar with linux, that's why i appreciate your help.
You can either upgrade to Debian buster, which has 4.19, or install a kernel from stretch-backports, which is also 4.19. Assuming you have amd64 hardware that would be https://packages.debian.org/stretch-backports/linux-image-amd64. See also https://backports.debian.org/Instructions/ for more instructions.
Some background information below, from how I remember things. Do note that there were many details and I may be mistaken about some of them.
At the time of 4.18 there was some issue with the timing that caused non-bit- perfect playback, resulting in audio artefacts that were hard to detect as it was near perfect. DSD over PCM (DoP) mode however made it very obvious this issue existed, as it would not work reliably at all. It was also noticeable when listening to a fixed Hz tone, it wasn't perfectly smooth.
I believe there was some significant refactoring going on with snd_dice at the cause, which caused some previously working things to stop working as snd_dice became more compliant with device's listed features and protocols.
Older versions "just sent a new stream" when frequency changed (iirc), which actually caused the DAC to sometimes not catch the signal and made it silent. You then had to restart jack (or ALSA stream) a few times. The new version used proper lock mechanism (AMDTP?) meaning it worked 100% of the time, except for the non-bit-perfect issue.
Since those days of experimenting I have been running snd_dice and snd_firewire_lib from sound-4.4-rc7-692-g2eb65d67afbf out of tree, with minor patches to make them compatible with modern kernels and overrides for the DAC.
Thanks for the mention Takashi, I appreciate it. Since I am running 5.5.17 (buster-backports) kernel right now I will do some testing later today to see if there are still any issues in this version, the Mytek is still used daily.
Cheers,
Hi Takashi,
On Friday, 22 May 2020 13:36:13 CEST Melvin Vermeeren wrote:
Since I am running 5.5.17 (buster-backports) kernel right now I will do some testing later today to see if there are still any issues in this version, the Mytek is still used daily.
I have just tested it with 5.5.17 and can confirm this issue still exists. It is not very noticeable when playing music but it instantly apparent when playing a 500hz tone for a few seconds. It sounds there is some small ticking in the background instead of a pure tone. Happens every few hundred milliseconds or so and is fully consistent, as if a timing or cycle issue.
Next I checked with current master v5.7-rc2-1808-g40e1763b6246 (snd_dice and snd_firewire_lib) with the same results. I believe the status is the same posted in 2018[1][2]. The old out-of-tree have served me well throughout the years, so I will probably keep using them for now. Perhaps this final issue will be found one day, if I can help you with anything please let me know.
[1] https://www.alsa-project.org/pipermail/alsa-devel/2018-June/136829.html [2] https://www.alsa-project.org/pipermail/alsa-devel/2018-June/137160.html
Thanks,
participants (3)
-
Melvin Vermeeren -
Pascal Bomel -
Takashi Sakamoto