Audio pass through (AC3, DTS-HD, ...)

tester3 · Published in 2016-5-18 08:50:14

I have made a clean build but I am experiencing video problems (switching between normal state and "no input signal" every few seconds). It looks familiar to issue reported by xonex here:
http://www.orangepi.org/orangepi ... &fromuid=914597

jernej · Published in 2016-5-19 06:59:52

I updated passthrough patches. Please pull latest sources and try again.

manatouboji · Published in 2016-5-19 12:58:16

I see it , and will tell you result tonight.

manatouboji · Published in 2016-5-19 22:14:41

Edited by manatouboji at 2016-5-20 00:43

Good news: sounds are back , in the GUI. for 2-channal AAC soundtrack MP4 files, sounds OK.

Bad news:
for DD 5.1 track, AV Receiver display "Dolby Digital" , but sounds bad.

for DTS-HD MA track, no sound and no "DTS HD" displayed. but after turnoff Passthrough, stereo sound can be heard.

jernej · Published in 2016-5-20 03:32:26

Ok, thanks for testing. Can you delete patch projects/H3/patches/linux/linux-93-hdmi-fix-raw-output.patch, rebuild and retest?

manatouboji · Published in 2016-5-20 11:14:29

even worse，no any sound at all, no Dolby Digital 5.1 , no DTS.

Turn off Passtrough , no sound .

jernej · Published in 2016-5-20 22:42:34

Please test latest changes. Can you also test latest released build? Now I'm beginning to understand what is needed for that and I'm just curious if it's working.

manatouboji · Published in 2016-5-20 23:06:30

The “even worse” one is just your asked one that disabled the linux-93 patch.

jernej · Published in 2016-5-20 23:13:34

Edited by jernej at 2016-5-20 16:23

manatouboji replied at 2016-5-20 16:06
The “even worse” one is just your asked one that disabled the linux-93 patch.

I know. In the mean time I pushed new code. However, it seems that there might not be need to do anything at all and latest pre-build images should work with passtrough.

Following formats should be supported:
PCM = 1,
      AC3 = 2,
      MPEG1 = 3,
      MP3 = 4,
      MPEG2 = 5,
      AAC = 6,
      DTS = 7,
      ATRAC = 8,
      ONE_BIT_AUDIO = 9,
      DOLBY_DIGITAL_PLUS = 10,
      DTS_HD = 11,
      MAT = 12,
      DST = 13,
      WMAPRO = 14.

TrueHD and DTS MA are obviously unsupported.

EDIT: Kodi doesn't support passthrough for all above formats.
EDIT2: Is MAT actually TrueHD?

jernej · Published in 2016-5-20 23:31:23

One github user confirmed working passthrough on unmodified images. It works for most formats except for DTS MA and TrueHD. At this point is unclear if this is HW limitation. Because it is very hard to do anything without actual HW and some passtrough formats work, I will put this effort on hold.