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lintweaker / xmos-native-dsd

native DSD playback support on Linux for USB DACs
GNU General Public License v2.0
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Add support for TEAC UD-501/UD-503/NT-503 #26

Closed nobnob77 closed 7 years ago

nobnob77 commented 7 years ago

This patch is reported as the issue#24: "[Solved] TEAC-503 native dsd".

kimmot commented 7 years ago

I have tested this patch by applying it into Daphile kernel. One Daphile user who has TEAC UD-503 (0644:8043) tried it and got native DSD working but there was some background noise. Then I changed the DSD sample format used in patch from SNDRV_PCM_FMTBIT_DSD_U32_LE to SNDRV_PCM_FMTBIT_DSD_U32_BE and noise was gone. However there are bad burst noises between track transitions from one rate to another: PCM->DSD, DSD64 -> DSD128, etc...

nobnob77 commented 7 years ago

Thank you for trying this patch. First, I had a misunderstanding of the endian. "SNDRV_PCM_FMTBIT_DSD_U32_BE" is right. I already commit it. And second, the burst noises on transions is resolved by the following patch in my environment. Try it please.

"native-dsd-noise-linux-4.0.8.patch" linked from this page. https://sites.google.com/site/digififan/info/native-dsdzaishengshinopoppunoizuniduiyingshitakernelwogongkaishimashita

kimmot commented 7 years ago

Based on the first feedback from a Daphile user the patch with SNDRV_PCM_FMTBIT_DSD_U32_BE and "native-dsd-noise-linux-4.0.8.patch" together seems to work fine with TEAC UD-503. No more noise with native DSD, not even at track-to-track transitions. THANKS nobnob77!!!

nobnob77 commented 7 years ago

I hope to merge this patch into the kernel src. I will take the necesarry steps. "ALSA Development list" project is probably the right one. So, I will close this pull request soon.