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

andrejb · Published in 2016-6-18 05:13:12

jernej replied at 2016-6-18 04:45
Strange, my display supports just normal sound (pcm) and I get that "digital" noise out, if I set ab ...

reboot
# amixer -c sndhdmi sset "hdmi audio format Function" AC3
Simple mixer control 'hdmi audio format Function',0
  Capabilities: enum
  Items: 'null' 'pcm' 'AC3' 'MPEG1' 'MP3' 'MPEG2' 'AAC' 'DTS' 'ATRAC' 'ONE_BIT_AUDIO' 'DOLBY_DIGITAL_PLUS' 'DTS_HD' 'MAT' 'WMAPRO'
  Item0: 'AC3'

play DD track - plays ok.. but if i switch to lets say dts-ma stream there is silence and when i go back to ac3 there is silence from this point on.. i need to reboot to get ac3 back

jernej · Published in 2016-6-22 06:32:29

new image for test: https://transfer.sh/ata2E/openel ... r22866-gc728002.tar

If it doesn't work, please copy & paste output of "dmesg | grep hdmi"

andrejb · Published in 2016-6-23 22:51:26

Edited by andrejb at 2016-6-23 22:53

1. update
2. reboot
3. play an mkv that has streams: 1. truhd, 2. dd and 3. dd+
- it defaulted to dd+ (as i watched it last), no sound, switched to dd no sound, switched to truhd no sound.. leave on truhd)
4. reboot
5. play the same file this time defaulting to truhd and no sound, shifting to DD no sound, shifting to dd+ no sound.. switched back to truhd
6. reboot
7. tried to amixer -c sndhdmi sset "hdmi audio format Function" MAT - i get
amixer: Unable to find simple control 'hdmi audio format Function',0
8. tried to play a dts hd stream no sound, switched to dd no sound
9. reboot
10. tried to play dd stream no sound..

with this patch i get no passthru with any of the streams

# dmesg | grep hdmi
[ 2.228946] asoc: sndhdmi <-> sunxi-hdmiaudio.0 mapping ok
[ 2.321530] [HDMI] power vcc-hdmi-18
[ 2.407195] #1: sndhdmi
[ 20.447159] [hdmi audio][sunxi_sndhdmi_hw_params]
[ 20.447469] [hdmi audio][sndhdmi_hw_params]
[ 20.447477] [hdmi audio][tdm2_hw_params]
[ 20.447484] [hdmi audio][sunxi_pcm_hw_params]
[ 20.447592] [hdmi audio][sndhdmi_prepare]
[ 20.460037] [hdmi audio][sndhdmi] Prepare format: 1
[ 20.460260] [hdmi audio][i2s2] channels: 2
[ 20.460614] [hdmi audio][sndhdmi_prepare]
[ 20.480026] [hdmi audio][sndhdmi] Prepare format: 1
[ 20.480241] [hdmi audio][i2s2] channels: 2
[ 45.237933] [hdmi audio][sndhdmi_prepare]
[ 45.250096] [hdmi audio][sndhdmi] Prepare format: 1
[ 45.250325] [hdmi audio][i2s2] channels: 2
[ 45.261128] [hdmi audio][sunxi_sndhdmi_hw_params]
[ 45.261444] [hdmi audio][sndhdmi_hw_params]
[ 45.261452] [hdmi audio][tdm2_hw_params]
[ 45.261459] [hdmi audio][sunxi_pcm_hw_params]
[ 45.261645] [hdmi audio][sunxi-sndhdmi] Format: 2
[ 45.261668] [hdmi audio][sndhdmi_prepare]
[ 45.280057] [hdmi audio][sndhdmi] Prepare format: 2
[ 45.280290] [hdmi audio][i2s2] channels: 2
[ 45.280491] [hdmi audio][sndhdmi_prepare]
[ 45.300073] [hdmi audio][sndhdmi] Prepare format: 2
[ 45.300303] [hdmi audio][i2s2] channels: 2
[ 55.501046] [hdmi audio][sndhdmi_prepare]
[ 55.520089] [hdmi audio][sndhdmi] Prepare format: 2
[ 55.520329] [hdmi audio][i2s2] channels: 2
[ 55.520657] [hdmi audio][sunxi-sndhdmi] Format: 1
[ 55.530630] [hdmi audio][sunxi_sndhdmi_hw_params]
[ 55.530938] [hdmi audio][sndhdmi_hw_params]
[ 55.530946] [hdmi audio][tdm2_hw_params]
[ 55.530954] [hdmi audio][sunxi_pcm_hw_params]
[ 55.531001] [hdmi audio][sndhdmi_prepare]
[ 55.550071] [hdmi audio][sndhdmi] Prepare format: 1
[ 55.550308] [hdmi audio][i2s2] channels: 2
[ 55.550574] [hdmi audio][sndhdmi_prepare]
[ 55.570084] [hdmi audio][sndhdmi] Prepare format: 1
[ 55.570321] [hdmi audio][i2s2] channels: 2
[  115.775453] [hdmi audio][sndhdmi_prepare]
[  115.790150] [hdmi audio][sndhdmi] Prepare format: 1
[  115.790403] [hdmi audio][i2s2] channels: 2

jernej · Published in 2016-6-23 23:51:35

Thanks, it seems that I have to redesign half of hdmi audio driver just to support standard way of setting passthrough...

IanPH · Published in 2016-7-17 19:00:27

@jernej:
I'm not much of a developer myself. But when you want me to do some debugging for you, let me know.
It was a bit of a surprise when I found out passthrough is not working (yet) on Orange PI and I would like to help with it as much as I'm capable to do.

jernej · Published in 2016-7-18 06:09:53

It works, but only partially. Only high rate formats like TrueHD don't work. The reason why it doesn't work is driver architecture. I tried to rework it, but I stopped in the middle. I might continue some day.

manatouboji · Published in 2016-9-18 00:47:35

For the latest git version, DTS-HD soundtrack don't work, the AV Receiver displayed "Multi In", so it means received multi track sound but no any sound.

jernej · Published in 2016-9-18 03:29:11

manatouboji replied at 2016-9-17 17:47
For the latest git version, DTS-HD soundtrack don't work, the AV Receiver displayed "Multi In", so i ...

Isn't that the same as before?

manatouboji · Published in 2016-9-30 10:51:38

jernej replied at 2016-9-18 03:29
Isn't that the same as before?

It looks not the same , but no any sound yet.

andrejb · Published in 2017-2-3 01:48:25

is there a chance that this feature can be pushed further?

i am using my orange pi's for media center (among other purposes), but i think it will be a killer feature for orange pi if it will have the HD pass through. None of the pi's has it (the raspberry pi is hardware limited), and everybody is seeking this feature, so they can have a pi for a media center.

Maybe I can check a little more if I get some points on how and where to start (meaning directly, files, functions, what to check, change, test, report,...)