[Quick Question about Android Auto Hi-Res.]

8 minutes ago, iamgabrieler said:

Hi! I know Android Auto a fair bit, so allow me to explain some things.

Android Auto does output audio via USB when connected in wired mode and via Wi-Fi when connected Wirelessly.

Bluetooth is not used for media streams in Android Auto. It's used for routing phone calls to the car and for comunicating WiFi SSID + Encryption key to the phone for wireless connection. 

Android Auto has a AAC Encoder which outputs in MP4A-LATM at 512000 bits per second. Basically Android Auto takes the whole audio processing and whatever it receives from a media stream it outputs it to the car with its encoding solution. 

 

wow really? MP4A AAC? that sucks. what about Apple carplay?

[Quick Question about Android Auto Hi-Res.]

13 minutes ago, andrewilley said:

My own honest (if perhaps cynical) take on car stereo playback is that there's road noise, wind noise, engine noise, other vehicles... etc, etc. And probably an underpowered amplifier and crap speakers vibrating in the doors.

There's no way that anyone can actually tell the difference between CD quality and high-res while driving - you're probably lucky to hear it at all!

Andre

you're probably right. Could be just my internal biases kicking in making me believe i'm enjoying it more (which is fine by me then haha)

For most cars you are right, Car speakers taken from generic Speaker maker XYZ and stuff...  but on the higher end luxury cars now with their superb external noise isolation and speaker design with whopping power. it actually sounds great imo at least. the BMW 8 Series gran coupe with the 1500w Bowers & WIlkin set up/ S class w/ 1800w Burmester or even the cheaper Mazda 3 with Bose sounds great (not as good as an actual studio though) [last i tested these cars was using a USB Removable device with music stored in]

but for the most part yeah you're right.

[Android Mixer still kicks in despite using Hi-Res output when using Dragonfly Cobalt]

I see. I'll try to figure out the conditions. Thanks for the info max.

[Quick Question about Android Auto Hi-Res.]

Ooh Really? damn. I was told that it was lossless PCM by people irl and google forums. good to know, thanks for the info max

[Android Mixer still kicks in despite using Hi-Res output when using Dragonfly Cobalt]

9 minutes ago, John Titor said:

Can you post a log of dumpsys again but this time with uapp? 

Actually i don't need to post it....   its exactly the same....  (with same music with 96khz Output) yet Dragonfly is reporting the 96kHz output. I suspect it has to do with UAPP bypassing android mixer completely with its own custom USB/Wireless driver (the point of getting UAPP). Though isn't this also what the experimental Hi-Res Output in Poweramp should also do in theory?

[Android Mixer still kicks in despite using Hi-Res output when using Dragonfly Cobalt]

1 minute ago, John Titor said:

Can you post a log of dumpsys again but this time with uapp? 

standby

[Android Mixer still kicks in despite using Hi-Res output when using Dragonfly Cobalt]

Just now, John Titor said:

 

Output thread 0xb400006fdabcb170, name AudioOut_23D, tid 16831, type 1 (DIRECT):
-   I/O handle: 573
-   Standby: yes
-   Sample rate: 96000 Hz
-   HAL frame count: 7680
-   HAL format: 0x6 (AUDIO_FORMAT_PCM_24_BIT_PACKED)

Hah! According to dumpsys log, Android is indeed outputting audio at 96kHz sample rate 24 bit depth. I don't know why exactly Dragonfly isn't recognising that...

Check below, Output devices is marked empty. so the 96khz stream is reaching nowhere i think. the USB device is slotted into AudioOut_1D which is 48khz. I think its like that

[Android Mixer still kicks in despite using Hi-Res output when using Dragonfly Cobalt]

I see mentions of the 96khz Audio but it seems that android is assigned "AUDIO_DEVICE_OUT_USB_HEADSET" to a 48khz stream. not the 96khz one as per Poweramp...

[Android Mixer still kicks in despite using Hi-Res output when using Dragonfly Cobalt]

Okay, Here's the updated Debug Log via Wireless ADB and music continuously playing through the USB-C Dragonfly DAC. @John Titor

Debug.txt

[Android Mixer still kicks in despite using Hi-Res output when using Dragonfly Cobalt]

1 minute ago, John Titor said:

Lol haha, but please don't post the log from there directly here. Save it into a txt file and drop it here. It's just that.... it's making the page too long and I have to scroll all the way to the bottom to reply 

standby, also will do, Good advice. this is the first time debugging for me haha

[Android Mixer still kicks in despite using Hi-Res output when using Dragonfly Cobalt]

2 minutes ago, John Titor said:

Hmm, from the log, I don't see a direct output thread as I expected. And Android mixer kicking in is normal. Don't worry about that.

 

The weird thing in my opinion is that the logs say there were no USB input nor any USB output threads.... However I am not an expert on this, and I won't be able to assist understanding the logs further.

 

Maybe Max would be able to shed some light on this.... I would suggest waiting for his input.

oh lol thats because I was using USB debugging and Dragonfly is a USB device so it wasn't connected. holy fuck now that i realize this is an absolute retard moment for me. let me pull up the flinger via Wireless ADB... once i figure out how to make it work

[Quick Question about Android Auto Hi-Res.]

56 minutes ago, andrewilley said:

That would depend on the particular device. If I understand it correctly, audio doesn't actually go via the USB connection anyway, but is routed through the Bluetooth connection, but I could be wrong. Some high-end BT devices support high-res, but most don't. 

Andre

when i first used AA, i thought that as well but from my experience (with the new Mazda's Bose and BMW's Harman Kardon w/ iDrive 7) i think it actually routes through the USB and/or WIFI-Direct (For Wireless Android auto) considering that in both cars, the BT is registered to only be used for telephony with music audio disconnected when AA is connected. and i can definitely hear the difference with AA vs BT. Though question is, is does Poweramp stream hi res to AA or is it stuck with the standard 16/44.1khz mode?

[Quick Question about Android Auto Hi-Res.]

Hey ho!

Quick question to the community. Does Poweramp v3 Output Hi-Res via Android Auto to the car's headunit/audio system? or is it just at CD quality?

[Android Mixer still kicks in despite using Hi-Res output when using Dragonfly Cobalt]

9 minutes ago, andrewilley said:

You take four weeks to reply, and then expect a solution in 24 hours?  As this is a very specialised and expensive bit of kit, I doubt Max has one to hand to do any testing.

Andre

Ah I'm sorry, It was not my intention to be rude or anything, if it was passed that way i'm truly sorry. Social skills isn't one of my strong point hahaha.

alright  thanks for the heads up though. yeah its expensive kit though from looking around it seems that people are saying that android OS just hijacks audio streams and puts it through its 48khz mixer unless you use apps that have specific drivers that support DIRECT. though i'm not an expert in this matter haha

[Android Mixer still kicks in despite using Hi-Res output when using Dragonfly Cobalt]

so...  Any solutions to this? or none from Poweramp's side?

[Android Mixer still kicks in despite using Hi-Res output when using Dragonfly Cobalt]

This is the adb dump for audio flinger.

All my music apps (Spotify, Tidal and Poweramp) displays 48khz on dragonfly (and i persume android auto as well) despite Poweramp reporting 96khz (example). only UAPP seems to bypass this issue all together.

[Android Mixer still kicks in despite using Hi-Res output when using Dragonfly Cobalt]

[Debug Log Removed due to it being done wrong and also wasting space. Updated new debug log at the bottom via txt file]

@maxmp@John Titor

[Android Mixer still kicks in despite using Hi-Res output when using Dragonfly Cobalt]

@Someguyonline  let me give it a try

[Android Mixer still kicks in despite using Hi-Res output when using Dragonfly Cobalt]

Dragonfly color is still reporting 48kHz after restart as well (and no other application running) though Poweramp still reports as 96kHz being pushed. Its like the android mixer system is still intercepting Poweramp's audio at the end.

[Android Mixer still kicks in despite using Hi-Res output when using Dragonfly Cobalt]

@maxmp let me try it again after a system reset.

[Android Mixer still kicks in despite using Hi-Res output when using Dragonfly Cobalt]

Poweramp reports that it is sending 96khz but Dragonfly only registers it as 48khz so i assume that Poweramp hasn't bypassed android's built in mixer.

[Android Mixer still kicks in despite using Hi-Res output when using Dragonfly Cobalt]

there we go

[Android Mixer still kicks in despite using Hi-Res output when using Dragonfly Cobalt]

eh, seems the attachement didn't pass through, give me one minute

[Android Mixer still kicks in despite using Hi-Res output when using Dragonfly Cobalt]

@andrewilley

[Android Mixer still kicks in despite using Hi-Res output when using Dragonfly Cobalt]

Poweramp Build 883-893
Oneplus 8 Pro (OxygenOS11 Latest stable)

Hey, When i tested the hi res output of 96khz/24 to my Dragonfly cobalt via USB Audio, the Dragonfly only registered 48Khz despite Power-amp saying that its delivering 96Khz audio (this was tested with UAPP uninstalled). When tested using UAPP, the Dragonfly registered 96khz. Is this a bug or am i doing something wrong?